#include <bits/stdc++.h>
//#include <atcoder/all>
using namespace std;
//using namespace atcoder;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
//using mint = modint998244353;
int main(){
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);

    ll n;
    cin >> n;

    vector<vector<bool>> num(100,vector<bool>(10,0));

    for(ll i = 1; i < 10; i++){
        for(ll t = 1; t < 10; t++){
            num[i*t][i] = 1;
            num[i*t][t] = 1;
        }   
    }

    vector<ll> in(n-1,0);
    for(ll i = 0; i < n-1; i++){
        cout << "? " << i << " " << n-1 << endl;
        cin >> in[i];
    }

    vector<vector<ll>> ans(10,vector<ll>(n,0));
    ans[0][n-1] = -1;
    for(ll i = 1; i < 10; i++){
        ans[i][n-1] = i;
        for(ll t = 0; t < n-1; t++){
            if(in[t] % i != 0 || in[t] / i >= 10){
                ans[i][n-1] = -1;
                break;
            }
            ans[i][t] = in[t] / i;
        }
    }

    
    if(n == 2){
        if(in[0] == 1){
            cout << "! 11" << endl;
        }else if(in[0] == 25){
            cout << "! 55" << endl;
        }else if(in[0] == 49){
            cout << "! 77" << endl;
        }else if(in[0] == 64){
            cout << "! 88" << endl;
        }else if(in[0] == 81){
            cout << "! 99" << endl;
        }else cout << "! -1" << endl;
    }else{
        pair<ll,ll> ask = {-1,-1};
        for(ll i = 0; i < n-1; i++){
            for(ll t = i+1; t < n-1; t++){
                ll count = 0;
                set<ll> val;
                for(ll u = 1; u < 10; u++){
                    if(ans[u][n-1] != -1){
                        count++;
                        val.insert(ans[u][i] * ans[u][t]);
                    }
                }
    
                if(val.size() == count){
                    ask = {i,t};
                    break;
                }
            }
    
            if(ask.first != -1)break;
        }
    
        if(ask.first == -1){
            cout << "! -1" << endl;
        }else{
            cout << "? " << ask.first << " " << ask.second << endl;
            ll x;
            cin >> x;
            for(ll i = 1; i < 10; i++){
                if(ans[i][n-1] != -1 && ans[i][ask.first] * ans[i][ask.second] == x){
                    cout << "! ";
                    for(ll t = n-1; t >= 0; t--){
                        cout << ans[i][t];
                    }
                    cout << endl;
                    break;
                }
            }
        }
    }
    

}