def checkerd(first):
    current = ord(first)
    while True:
        yield chr(current)
        current^=21

W,H,C = input().split()
W,H = map(int,[W,H])
pattern = checkerd(C)
checkerd_pattern = ["".join([pattern.__next__() for x in range(W)]) for y in range(H)]
for line in checkerd_pattern:
    print(line)