H, W, A, B = map(int, input().split())

for _ in range(B):
    print("0" * (A) + "1" * (W - A))
for _ in range(H - B):
    print("1" * (A) + "0" * (W - A)) H, W, A, B = map(int, input().split()) H map(int, input().split()) map int input().split() ().split () input split W A B for _ in range(B):
    print("0" * (A) + "1" * (W - A)) _ range(B) range B print("0" * (A) + "1" * (W - A)) print "0" * (A) + "1" * (W - A) "0" * (A) "0" A "1" * (W - A) "1" W - A W A for _ in range(H - B):
    print("1" * (A) + "0" * (W - A)) _ range(H - B) range H - B H B print("1" * (A) + "0" * (W - A)) print "1" * (A) + "0" * (W - A) "1" * (A) "1" A "0" * (W - A) "0" W - A W A B = map(int, input().split()) map(int, input().split()) B W, A, B = map(int, input().split()) map(int, input().split()) W H, W, A, B = map(int, input().split()) map(int, input().split()) H A, B = map(int, input().split()) map(int, input().split()) A
H, W, A, B = map(int, input().split())

for _ in range(B):
    print("0" * (A) + "1" * (W - A))
for _ in range(H - B):
    print("1" * (A) + "0" * (W - A))
