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>
#include<string.h>

int main() {
    int times; // クジの回数.
    scanf("%d", &times);
    int count = 0; // 景品の種類の数.
    char str[times][10]; // 景品を格納する配列.

    for(int n = 0; n < times; n++) {
        scanf("%s", str[n]);
        int duplicate = 0; // 重複している数.
        for(int m = 0; m < n; m++) { // 今までの入力と比較する.
            if(strcmp(str[m], str[n]) == 0) duplicate++;
        }
        // 重複がない場合はカウント.
        if(duplicate == 0) count++;
        else n--;
    }
    printf("%d\n", count);
}