#include <iostream> using namespace std; int main(){ string T; int m = 0; int h = 0; cin >> T; m = int(T[3]-'0')*10 + int(T[4]-'0') + 5; h = int(T[0]-'0')*10 + int(T[1]-'0'); if(m/60==1){ h += 1; } if(m/60==1 && h/24==1){ m%=60; h%=24; cout << "0" + to_string(h) << ":"<< "0" + to_string(m) << endl; }else if(m/60==1){ m%=60; cout << to_string(h) << ":" << "0" + to_string(m) << endl; }else{ cout << to_string(h) << ":" << to_string(m) << endl; } return 0; }