#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    string s;
    cin >> s;
    set<string> st;
    s += s;
    while(true) {
        rep(i,26) {
            string t = s.substr(1);
            t += 'a' + i;
            if(!st.count(t)) {
                cout << "? " << t << endl;
                st.insert(t);
                break;
            }
        }
        string r, t;
        cin >> r >> t;
        if(t=="WIN") break;
        st.insert(t);
        s = t;
    }
    return 0;
}