#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  VI a(n);
  auto ask = [&](int i, int j) {
    i = n - 1 - i;
    j = n - 1 - j;
    if (i > j) swap(i, j);
    cout << "? " << i << ' ' << j << endl;
    int p;
    cin >> p;
    return p;
  };
  int i1 = -1, i2 = -1;
  for (int i = 1; i < n; i++) {
    a[i] = ask(0, i);
    if (a[i]) tie(i1, i2) = pair(i, i1);
  }
  if (i2 != -1) {
    a[0] = sqrt(a[i1] * a[i2] / ask(i1, i2));
  } else if (i1 != -1) {
    if (a[i1] == 1) a[0] = 1;
    else if (a[i1] == 25) a[0] = 5;
    else if (a[i1] == 49) a[0] = 7;
    else if (a[i1] == 64) a[0] = 8;
    else if (a[i1] == 81) a[0] = 9;
  }
  if (!a[0]) {
    cout << "! " << -1 << endl;
    return 0;
  }
  rep(i, n) if (i) a[i] /= a[0];
  cout << "! ";
  rep(i, n) cout << a[i];
  cout << endl;
}