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)

class Main {

  static void bigger(int sheeps, int wolves )
  {
   if(sheeps<wolves)
    System.out.println("unsafe");
   if(sheeps==wolves)
       System.out.println("unsafe");
   else
    System.out.println("safe");
  }

  public static void main(String[] args) {
    bigger(40,23);
    bigger(10,23);
    bigger(23,23);    
  }


}