#define _USE_MATH_DEFINES
#include  <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
#include<math.h>
#include<iomanip>
#include<stdio.h>
#include <stdlib.h>
#include<stdio.h>
#include <queue>
#include<map>
#include <fstream>
#include <sstream>
#include<set>
#include<stack>
#include<time.h>
#include <sys/types.h>
#include <tuple>
#include <numeric>
#include <iterator>

typedef long long int ll;
//#include<bits/stdc++.h>


using namespace std;

ll gcd(ll a, ll b) {
    if (a < b)swap(a, b);
    if (b == 0)return a;
    return gcd(b, a % b);
}
int lcm(int a, int b) {
    return a * b / gcd(a, b);
}




int main()
{

    int Q;
    Q = 1;
    //cin >> Q;   

    while (Q--) {
        cout << "aa"<<endl;
        set<string>s;
        s.insert("aa");
        while (1) {
            string p;
            cin >> p;
            string x;
            cin >> x;
            
            if (p == "!") {
                return 0;
            }
            if (s.count(x)) {
                cout << "! LOSE" << endl;
                return 0;
            }
            s.insert(x);
            string t = "! ";
            t.push_back(x[1]);
            t.push_back('a');
            string tt;
            tt.push_back(x[1]); tt.push_back('a');
            s.insert(tt);
            cout << t << endl;
        }
    }
        return 0;
}