#include <bits/stdc++.h>
using namespace std;
int main(void){
    int n;
    cin>>n;
    if(n==2){
        cout<<"? 0 1"<<endl;
        int d;
        cin>>d;
        int sd=sqrtl(d);
        if(d==sd*sd&&sd!=0&&sd!=2&&sd!=3&&sd!=4&&sd!=6){
            cout<<"! "<<sd<<sd<<endl;
        }else{
            cout<<"! -1"<<endl;
        }
        return 0;
    }
    vector<int>d(n,0);
    int zero=0;
    for(int i=1;i<n;i++){
        cout<<"? "<<min(n-1,n-i-1)<<" "<<max(n-1,n-i-1)<<endl;
        cin>>d[i];
        if(!d[i])zero++;
    }
    vector<int>ans(n,-1);
    if(zero>=n-1){
        cout<<"! -1"<<endl;
        return 0;
    }else if(zero==n-2){
        for(int i=1;i<n;i++){
            if(d[i]){
                int sd=sqrtl(d[i]);
                if(d[i]==sd*sd&&sd!=0&&sd!=2&&sd!=3&&sd!=4&&sd!=6){
                    ans[0]=sd;
                }else{
                    cout<<"! -1"<<endl;
                    return 0;
                }
            }
        }
        cout<<"! "<<ans[0];
        for(int i=1;i<n;i++){
            cout<<d[i]/ans[0];
        }
        cout<<endl;
        return 0;
    }
    int a=-1,b=-1,d2;
    for(int i=1;i<n;i++){
        if(d[i]){
            if(a==-1){
                a=i;
            }else{
                b=i;
                cout<<"? "<<min(n-a-1,n-b-1)<<" "<<max(n-a-1,n-b-1)<<endl;
                cin>>d2;
                int d3=sqrtl(d2*d[a]*d[b]);
                ans[0]=d3/d2;
                break;
            }
        }
    }
    cout<<"! "<<ans[0];
    for(int i=1;i<n;i++){
        cout<<d[i]/ans[0];
    }
    cout<<endl;
    return 0;
}