def main():
	N, M = map(int, input().split())
	S = list(map(int, input().split()))
	T = list(map(int, input().split()))
	S.append(0)
	T.append(0)
	MOD = 10**9+7

	dp0 = [[0 for _ in range(M+2)] for _ in range(N+2)]
	dp1 = [[0 for _ in range(M+2)] for _ in range(N+2)]
	dp0[0][0] = 1
	for i in range(N+1):
		for j in range(M+1):
			dp0[i+1][j] += dp0[i][j]
			dp0[i+1][j] %= MOD
			dp1[i][j] += dp0[i][j]
			dp1[i][j] %= MOD
			dp1[i][j+1] += dp1[i][j]
			dp1[i][j+1] %= MOD

			if S[i] == T[j]:
				dp0[i+1][j+1] += dp1[i][j]
				dp0[i+1][j+1] %= MOD
	print(dp1[N][M])


if __name__ == '__main__':
	main() def main():
	N, M = map(int, input().split())
	S = list(map(int, input().split()))
	T = list(map(int, input().split()))
	S.append(0)
	T.append(0)
	MOD = 10**9+7

	dp0 = [[0 for _ in range(M+2)] for _ in range(N+2)]
	dp1 = [[0 for _ in range(M+2)] for _ in range(N+2)]
	dp0[0][0] = 1
	for i in range(N+1):
		for j in range(M+1):
			dp0[i+1][j] += dp0[i][j]
			dp0[i+1][j] %= MOD
			dp1[i][j] += dp0[i][j]
			dp1[i][j] %= MOD
			dp1[i][j+1] += dp1[i][j]
			dp1[i][j+1] %= MOD

			if S[i] == T[j]:
				dp0[i+1][j+1] += dp1[i][j]
				dp0[i+1][j+1] %= MOD
	print(dp1[N][M]) main N, M = map(int, input().split()) N map(int, input().split()) map int input().split() ().split () input split M S = list(map(int, input().split())) S list(map(int, input().split())) list map(int, input().split()) map int input().split() ().split () input split T = list(map(int, input().split())) T list(map(int, input().split())) list map(int, input().split()) map int input().split() ().split () input split S.append(0) S.append S append 0 T.append(0) T.append T append 0 MOD = 10**9+7 MOD 10**9+7 10**9 10 9 7 [0 for _ in range(M+2)] for _ in range(N+2) for _ in range(N+2) _ range(N+2) range N+2 N 2 for _ in range(N+2) [0 for _ in range(M+2)] dp0 = [[0 for _ in range(M+2)] for _ in range(N+2)] dp0 [[0 for _ in range(M+2)] for _ in range(N+2)] [0 for _ in range(M+2)] for _ in range(N+2) for _ in range(N+2) _ range(N+2) range N+2 N 2 for _ in range(N+2) [0 for _ in range(M+2)] dp1 = [[0 for _ in range(M+2)] for _ in range(N+2)] dp1 [[0 for _ in range(M+2)] for _ in range(N+2)] dp0[0][0] = 1 dp0[0][0] [0] dp0 0 0 1 for i in range(N+1):
		for j in range(M+1):
			dp0[i+1][j] += dp0[i][j]
			dp0[i+1][j] %= MOD
			dp1[i][j] += dp0[i][j]
			dp1[i][j] %= MOD
			dp1[i][j+1] += dp1[i][j]
			dp1[i][j+1] %= MOD

			if S[i] == T[j]:
				dp0[i+1][j+1] += dp1[i][j]
				dp0[i+1][j+1] %= MOD
	 i range(N+1) range N+1 N 1 for j in range(M+1):
			dp0[i+1][j] += dp0[i][j]
			dp0[i+1][j] %= MOD
			dp1[i][j] += dp0[i][j]
			dp1[i][j] %= MOD
			dp1[i][j+1] += dp1[i][j]
			dp1[i][j+1] %= MOD

			if S[i] == T[j]:
				dp0[i+1][j+1] += dp1[i][j]
				dp0[i+1][j+1] %= MOD
	 j range(M+1) range M+1 M 1 dp0[i+1][j] += dp0[i][j] dp0[i+1][j] [i+1] dp0 i+1 i 1 j dp0[i][j] [i] dp0 i j dp0[i+1][j] %= MOD dp0[i+1][j] [i+1] dp0 i+1 i 1 j MOD dp1[i][j] += dp0[i][j] dp1[i][j] [i] dp1 i j dp0[i][j] [i] dp0 i j dp1[i][j] %= MOD dp1[i][j] [i] dp1 i j MOD dp1[i][j+1] += dp1[i][j] dp1[i][j+1] [i] dp1 i j+1 j 1 dp1[i][j] [i] dp1 i j dp1[i][j+1] %= MOD dp1[i][j+1] [i] dp1 i j+1 j 1 MOD if S[i] == T[j]:
				dp0[i+1][j+1] += dp1[i][j]
				dp0[i+1][j+1] %= MOD
	 S[i] == T[j] S[i] S i T[j] T j dp0[i+1][j+1] += dp1[i][j] dp0[i+1][j+1] [i+1] dp0 i+1 i 1 j+1 j 1 dp1[i][j] [i] dp1 i j dp0[i+1][j+1] %= MOD dp0[i+1][j+1] [i+1] dp0 i+1 i 1 j+1 j 1 MOD print(dp1[N][M]) print dp1[N][M] [N] dp1 N M if __name__ == '__main__':
	main() __name__ == '__main__' __name__ '__main__' main() main def main():
	N, M = map(int, input().split())
	S = list(map(int, input().split()))
	T = list(map(int, input().split()))
	S.append(0)
	T.append(0)
	MOD = 10**9+7

	dp0 = [[0 for _ in range(M+2)] for _ in range(N+2)]
	dp1 = [[0 for _ in range(M+2)] for _ in range(N+2)]
	dp0[0][0] = 1
	for i in range(N+1):
		for j in range(M+1):
			dp0[i+1][j] += dp0[i][j]
			dp0[i+1][j] %= MOD
			dp1[i][j] += dp0[i][j]
			dp1[i][j] %= MOD
			dp1[i][j+1] += dp1[i][j]
			dp1[i][j+1] %= MOD

			if S[i] == T[j]:
				dp0[i+1][j+1] += dp1[i][j]
				dp0[i+1][j+1] %= MOD
	print(dp1[N][M]) def main():
	N, M = map(int, input().split())
	S = list(map(int, input().split()))
	T = list(map(int, input().split()))
	S.append(0)
	T.append(0)
	MOD = 10**9+7

	dp0 = [[0 for _ in range(M+2)] for _ in range(N+2)]
	dp1 = [[0 for _ in range(M+2)] for _ in range(N+2)]
	dp0[0][0] = 1
	for i in range(N+1):
		for j in range(M+1):
			dp0[i+1][j] += dp0[i][j]
			dp0[i+1][j] %= MOD
			dp1[i][j] += dp0[i][j]
			dp1[i][j] %= MOD
			dp1[i][j+1] += dp1[i][j]
			dp1[i][j+1] %= MOD

			if S[i] == T[j]:
				dp0[i+1][j+1] += dp1[i][j]
				dp0[i+1][j+1] %= MOD
	print(dp1[N][M]) main
def main():
	N, M = map(int, input().split())
	S = list(map(int, input().split()))
	T = list(map(int, input().split()))
	S.append(0)
	T.append(0)
	MOD = 10**9+7

	dp0 = [[0 for _ in range(M+2)] for _ in range(N+2)]
	dp1 = [[0 for _ in range(M+2)] for _ in range(N+2)]
	dp0[0][0] = 1
	for i in range(N+1):
		for j in range(M+1):
			dp0[i+1][j] += dp0[i][j]
			dp0[i+1][j] %= MOD
			dp1[i][j] += dp0[i][j]
			dp1[i][j] %= MOD
			dp1[i][j+1] += dp1[i][j]
			dp1[i][j+1] %= MOD

			if S[i] == T[j]:
				dp0[i+1][j+1] += dp1[i][j]
				dp0[i+1][j+1] %= MOD
	print(dp1[N][M])


if __name__ == '__main__':
	main()