#include<bits/stdc++.h>
//#include <iostream>
//#include <iomanip>
//#include <vector>
//#include <cmath>
//#include <algorithm>
using namespace std;


#define F first
#define PB push_back
#define MP make_pair

typedef  long long ll;

ll p = pow(10, 9) + 7;





int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
  int s, w;
  cin >> s >> w;
  if(s > w){
    cout << "save" << endl;
  }else{
    cout<<"unsafe" << endl;
  }
   
}
