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

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

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

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

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



while True:
    print("+","C","C","A",flush=True)
    ret=int(input())
    print(ret, file=sys.stderr, flush=True)


    A=[]

    for i in range(6):
        print("?","A",flush=True)
        print(ret, file=sys.stderr, flush=True)
        ret=int(input())
        A.append(ret)
        if ret!=0:
            break

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

    if CA.most_common()[0][1]>=6 and A==0:
        break

count=0
NOW=[0,B0,0]

X=[0,B0]
while X[-1]!=A0*B0:
    if X[-1]+X[-1]<=A0*B0:
        X.append(X[-1]*2)
    else:
        X.append(X[-1]+B0)

for i in range(1,len(X)):
    if (len(X)-i)%2==1:
        if X[i]==X[i-1]+B0:
            while True:
                print("+","A","B","C",flush=True)
                ret=int(input())
                print(ret, file=sys.stderr, flush=True)
                C=[]
                for i in range(6):
                    print("?","C",flush=True)
                    ret=int(input())
                    print(ret, file=sys.stderr, flush=True)
                    C.append(ret)
                    if ret!=NOW[0]+NOW[1]:
                        break
                CC=Counter(C)
                C=CC.most_common()[0][0]

                if CC.most_common()[0][1]>=6 and C==NOW[0]+NOW[1]:
                    NOW[2]=NOW[0]+NOW[1]
                    count+=1
                    break
        else:
            while True:
                print("+","A","A","C",flush=True)
                ret=int(input())
                print(ret, file=sys.stderr, flush=True)
                C=[]
                for i in range(6):
                    print("?","C",flush=True)
                    ret=int(input())
                    print(ret, file=sys.stderr, flush=True)
                    C.append(ret)
                    if ret!=NOW[0]+NOW[0]:
                        break
                CC=Counter(C)
                C=CC.most_common()[0][0]

                if CC.most_common()[0][1]>=6 and C==NOW[0]+NOW[0]:
                    NOW[2]=NOW[0]+NOW[0]
                    count+=1
                    break
    else:
        if X[i]==X[i-1]+B0:
            while True:
                print("+","C","B","A",flush=True)
                ret=int(input())
                print(ret, file=sys.stderr, flush=True)
                C=[]
                for i in range(6):
                    print("?","A",flush=True)
                    ret=int(input())
                    print(ret, file=sys.stderr, flush=True)
                    C.append(ret)
                    if ret!=NOW[1]+NOW[2]:
                        break
                CC=Counter(C)
                C=CC.most_common()[0][0]

                if CC.most_common()[0][1]>=6 and C==NOW[1]+NOW[2]:
                    NOW[0]=NOW[1]+NOW[2]
                    count+=1
                    break
        else:
            while True:
                print("+","C","C","A",flush=True)
                ret=int(input())
                print(ret, file=sys.stderr, flush=True)
                C=[]
                for i in range(6):
                    print("?","A",flush=True)
                    ret=int(input())
                    print(ret, file=sys.stderr, flush=True)
                    C.append(ret)
                    if ret!=NOW[2]+NOW[2]:
                        break
                CC=Counter(C)
                C=CC.most_common()[0][0]

                if CC.most_common()[0][1]>=6 and C==NOW[2]+NOW[2]:
                    NOW[0]=NOW[2]+NOW[2]
                    count+=1
                    break


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