S=eval(input())

ans=["x" for _ in range(len(S))]

print(("".join(ans)))
S = eval(input())

print(("".join(["x" for _ in range(len(S))])))
S = eval(input())
ans = ["x" for _ in range(len(S))]
print(("".join(ans)))

S = eval(input())
print(("".join(["x" for _ in range(len(S))])))

-ans = ["x" for _ in range(len(S))] -print(("".join(ans))) +print(("".join(["x" for _ in range(len(S))])))