#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

int main(){
    
    int n, h, m;
    string s;
    cin >> n;
    h = 10;
    m = 0;
    
    h += n / 100;
    m += ( n % 100 ) / 10;
    if (m < 10)
        s = "0" ;
    cout << h << ":" << s << m << endl;
    return 0;

    
}