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 Java (OpenJDK 11.0.6) (judge verdict: Wrong Answer)

import java.util.*;
import java.lang.*;

public class Main{

    public static void solve(long s , long w){
        if(w > s){
            System.out.println("unsafe");
        }else{
            System.out.println("safe");
        }
    }

    public static void gora(){
        Scanner scn = new Scanner(System.in);

        // long test = scn.nextLong();

        long s = scn.nextLong();

        long w = scn.nextLong();

        // long arr[] = new long[n];

        // for(int i = 0 ; i < arr.length ; i++){
        //     arr[i] = scn.nextLong();
        // }

        solve(s, w);
    }

    public static void main(String args[]){
        gora();
    }
}