alpha = input().strip()
used = set(list("abcdefghijklmnopqrstuvwxyz"))
used.discard(alpha)
print("?", alpha+alpha, flush=True)
while True:
    res,res2 = input().strip().split()
    if res=="!":
        exit()
    used.discard(res2[1])
    out = res2[1]+alpha
    print("?", out, flush=True)