import sys
input = sys.stdin.readline
from collections import Counter

A=[]
for i in range(10):
    print("?","A",flush=True)
    ret=int(input())
    A.append(ret)

B=[]
for i in range(10):
    print("?","B",flush=True)
    ret=int(input())
    B.append(ret)

CA=Counter(A)
A0=CA.most_common()[0][0]

CB=Counter(B)
B0=CB.most_common()[0][0]



while True:
    if A0<B0:
        print("+","C","C","A",flush=True)
        ret=int(input())

        A=[]

        for i in range(10):
            print("?","A",flush=True)
            ret=int(input())
            A.append(ret)

        CA=Counter(A)
        A=CA.most_common()[0][0]

        if A==0:
            break

    else:
        print("+","C","C","B",flush=True)
        ret=int(input())

        B=[]

        for i in range(10):
            print("?","B",flush=True)
            ret=int(input())
            B.append(ret)

        CB=Counter(B)
        B=CB.most_common()[0][0]

        if B==0:
            break


for i in range(min(A0,B0)):
    if A0<B0:
        print("+","A","B","C",flush=True)
    else:
        print("+","B","A","C",flush=True)

    ret=int(input())


while True:
    C=[]
    for i in range(10):
        print("?","C",flush=True)
        ret=int(input())
        C.append(ret)

    CC=Counter(C)
    C=CC.most_common()[0][0]

    if C==A0*B0:
        break

    if A0<B0:
        print("+","A","B","C",flush=True)
    else:
        print("+","B","A","C",flush=True)

    ret=int(input())

print("!","C",flush=True)