s = input()
x = len(s)
for i in range(x):
  print("x", end = '')
print() s = input() s input() input x = len(s) x len(s) len s for i in range(x):
  print("x", end = '') i range(x) range x print("x", end = '') print "x" end = '' end '' print() print s = input() input() s x = len(s) len(s) x
s = input()
x = len(s)
for i in range(x):
  print("x", end = '')
print()