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 <bits/stdc++.h>
 
using namespace std;

int main()
{
    
    string res;
    cin>>res;

    int ans = 0;
    long long int val = 0;

    unordered_map<int,int> hmap;
  	hmap[0] = 1;
    for(int i = 0;i< res.size();i++)
    {
        val = (val*10 + (res[i] - '0'))%2019;
        if(hmap.find(val) != hmap.end())
        {
          ans += hmap[val];
        }
      	hmap[val]++;
    }

    cout<<ans<<endl;
    return 0;
}