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

const long long INF = 1LL << 60;
#define MOD 1000000007;

typedef long long ll;

#define writeln(n) cout<<n<<endl;

typedef pair<float, float> P;

typedef pair<string, int> Psi;


int main() {

	string s;
	cin>>s;

	int h,m;

	sscanf(s.c_str(),"%d:%d",&h,&m);

	m +=5;

	if(m >=60){
		m = m%60;
		h+=1;
	}

	if(h >=24){
		h=0;
	}

	printf("%02d:%02d",h,m);
}