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 <stdio.h>

int main(void) {

    int s, w;
    char S[100 + 1];
    char W[100 + 1];
    char *x;
    char *y;
    
        x = fgets(S, sizeof(W), stdin);
        if (x != NULL) {
          sscanf(S,"%d\n", &s);
        }
        y = fgets(W, sizeof(W), stdin);
        if (y != NULL) {
           sscanf(W, "%d\n", &w);
        }
        if ((1 <= s && s <=101) && (1 <= w && w <= 100)) {
            if (s <= w) {
               printf("unsafe\n");
            }
            else {
                printf("safe\n");
            }
         }
    return 0;
}