Problem:
Score : 100 points

Problem Statement

There are S sheep and W wolves.

If the number of wolves is greater than or equal to that of sheep, the wolves will attack the sheep.

If the wolves will attack the sheep, print unsafe; otherwise, print safe.

Constraints

1 \leq S \leq 100

1 \leq W \leq 100

Input

Input is given from Standard Input in the following format:

S W

Output

If the wolves will attack the sheep, print unsafe; otherwise, print safe.

Sample Input 1

4 5

Sample Output 1

unsafe

There are four sheep and five wolves. The number of wolves is not less than that of sheep, so they will attack them.

Sample Input 2

100 2

Sample Output 2

safe

Many a sheep drive away two wolves.

Sample Input 3

10 10

Sample Output 3

unsafe

Solution in C++ (GCC 9.2.1) (judge verdict: Wrong Answer)

#include <bits/stdc++.h>
using namespace std;
 
#define FASTIO  ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define ll long long int
#define ld long double
#define vll vector<ll>
#define pll pair<ll,ll>
#define vl(p) vector<p>
#define W while
#define For(i,s,x) for(i=s;i<x;i++)
#define Fore(i,s,x) for(i=s;i<=x;i++)
#define FOR(i,x) for(i=0;i<x;i++)
#define Rof(i,s,x) for(i=s;i>=x;i--)
#define all(v) v.begin(),v.end()
#define it(r,v) for(auto r=v.begin();r!=v.end();r++)
#define pb push_back
#define in insert
#define sz size()
#define F first
#define S second
#define nl cout<<"\n"
#define pr(a) cout<<a<<" "
#define pr2(a,b) cout<<a<<" "<<b<<"\n"
#define pr3(a,b,c) cout<<a<<" "<<b<<" "<<c<<"\n"
#define mod 1000000007
#define mp make_pair
  int main()
  {
     FASTIO;
    ll s,w;
    cin>>s>>w;
    if(w>s)
    cout<<"unsafe";
    else
    cout<<"safe";
     }