#include <bits/stdc++.h>
using namespace std;
using ll=long long;

int main(){
	int x,y,z;
	{
		int cnt=0;
		map<int,int> mp;
		while(1){
			cout<<"? A"<<endl;
			cin>>z;
			mp[z]++;
			cnt++;
			if(cnt>=7&&mp[z]*2>cnt){
				x=z;
				break;
			}
		}
	}
			
	{
		int cnt=0;
		map<int,int> mp;
		while(1){
			cout<<"? B"<<endl;
			cin>>z;
			mp[z]++;
			cnt++;
			if(cnt>=7&&mp[z]*2>cnt){
				y=z;
				break;
			}
		}
	}
	if(y==1){
		cout<<"! A"<<endl;
		return 0;
	}
	int now=1;
	int k=1;
	while(k*2<=y){
		int cnt=0;
		map<int,int> mp;
		if(k==1){
			cout<<"+ A A C"<<endl;
		}else if(now==1){
			cout<<"+ B B C"<<endl;
		}else{
			cout<<"+ C C B"<<endl;
		}
		cin>>z;
		assert(z==0);
		bool ok=false;
		while(1){
			if(now==1){
				cout<<"? C"<<endl;
			}else{
				cout<<"? B"<<endl;
			}
			cin>>z;
			assert(z!=-1);		
			mp[z]++;
			cnt++;
			if(mp[x*k*2]>=4){
				ok=true;
				break;
			}else if(cnt==7){
				break;
			}
		}
		if(ok){
			now=1-now;
			k*=2;
		}
	}
	while(k<y){
		if(now==1)cout<<"+ A B C"<<endl;
		else cout<<"+ A C B"<<endl;
		cin>>z;
		assert(z==0);
		bool ok=false;
		map<int,int> mp;
		int cnt=0;
		while(1){
			if(now==1)cout<<"? C"<<endl;
			else cout<<"? B"<<endl;
			cin>>z;
			assert(z!=-1);
			mp[z]++;
			cnt++;
			if(mp[x*(k+1)]>=4){
				ok=true;
				break;
			}else if(cnt==7){
				break;
			}
		}
		if(ok){
			now=1-now;
			k++;
		}
	}
	if(now==1)cout<<"! B"<<endl;
	else cout<<"! C"<<endl;

}