#include <iostream>
#include <cstdio>
using namespace std;
                                                                                                
  
int main(){


    int a, b, d, t, m, x, y;

    string s;


    
    cin >> a >> b >> s;


    d = s.size() - 2;

    if( s.at(d) == '.'){

        sscanf( s.c_str(),"UTC%d.%d", &t, &m );

        if( m == 0 ){

            t = t - 9;

            m = ( 10 - m ) % 10;

            }

        if( m != 0 ){

            t = t - 8;

            m = ( m - 10 ) % 10;
     
            }

        }

    else{

          sscanf( s.c_str(),"UTC%d", &t);
          
          t = t - 9;

          m = 0;

          }
       


    x = ( a * 60 + b + ( t * 60 + m * 6 ) );

    y = ( a * 60 + b + ( t * 60 + m * 6 ) );


    if( x < 0 ) x = 24 + ( x / 60 );

    else x = x / 60;

    if( x >= 24 ) x = x % 24;


    if( x == 0 && y < 0 ){

        x = 24 - 1;

        y = y = 60 + ( y % 60 );

        }


    if( y < 0 ) y = 60 + ( y % 60 );

    else y = y % 60;


    if( y >= 60 ) y = y % 60;



    if( 10 > x && 10 > y ) cout << "0" << x << ":" << "0" << y << endl;

    else if( 10 > x ) cout << "0" << x << ":" << y << endl;

    else if( 10 > y ) cout << x << ":" << "0" << y << endl;


    else cout << x << ":" << y << endl;                       


    return 0;

}