#include<bits/stdc++.h>
typedef long long ll;
using namespace std;
int INF = 1e9;
int MOD = 1e9+7;
main(){
    int h,m;
    scanf("%d:%d",&h,&m);
    m += 5;
    printf("%02d:%02d\n",(h+m/60)%24,m%60);
}