#include<iostream>
#include<iomanip>
#include<cmath>
#include<string>
#include<algorithm>
#include<vector>
#include<math.h>
#include<stack>
using namespace std;
int H, M;
int main(){
    scanf("%d:%d", &H, &M);
    
    int m = H * 60 + M;
    m = (m + 5) % (24 * 60);
    
    printf("%02d:%02d\n", m / 60, m % 60);
    
    return 0;
}