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(void)
{
	int count = 1;
	int i, j;
	int N;
	scanf("%d", &N);
	char S[N][10];
	for (i = 0; i < N; ++i) {
		scanf("%s", S[i]);
		for (j = 0; j < i; ++j) {
			if (strcmp(S[j], S[i]) == 0) {
				break;
			}
		}
		if (i == j) {
			count++;
		}
	}
	printf("%d\n", count);	
	return 0;
}