import random

random.seed(1)

alphabets = "abcdefghijklmnopqrstuvwxyz"

written = set()

alpha = input()
print('?', alpha * 2)

written.add(alpha * 2)

for _ in range(5):
    cmd, T = input().split()
    
    assert T not in written
    written.add(T)
    
    print('?', T[::-1])
    
    written.add(T[::-1])

cmd, T = input().split()
written.add(T)

S = list({T[1] + a for a in alphabets} - written)[0]

print('?', S)

while True:
    cmd, T = input().split()
    
    if cmd == '!':
        exit()
    
    assert T not in written
    
    written.add(T)
    
    can_write = list(set(T[1] + a for a in alphabets) - written)
    
    if len(can_write) <= 0:
        print('!')
    else:
        S = random.choice(can_write)
        pre_char = S[1]
        written.add(S)
        print('?', S)