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 JavaScript (Node.js 12.16.1) (judge verdict: Wrong Answer)

function Main(input) {
	tmp = input.split("\n");
tmp.sort(function(a,b){
        if( a < b ) return -1;
        if( a > b ) return 1;
        return 0;
});
	
tmp.shift();


var c =0
var f =""
var n =""
var num =0
var len = tmp.length
for(let i = 1; i <= len ; i++) {
f= tmp[i-1]
n=tmp[i]
if(f!=n){  num++  }

}


 console.log(num)
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));