#include<iostream>
#include<vector>
#include<algorithm>

using namespace std;
using ll = long long;

void say(string s){
    cout<<"? "<<s<<endl;
}
int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    char c;
    cin>>c;
    string s = "";
    s += c;
    s += c;
    say(s);
    while(true){
        string t;
        cin>>t;
        if(t!="?") return 0;
        cin>>t;
        string s = "";
        s += t[1];
        s += c;
        say(s);
    }
}