using System;

​

using System.Text;

public class Solution 

{

    public static void Main(String[] args) 

    {

        string input = Console.ReadLine();

        StringBuilder sb = new StringBuilder(input);

​

        char ampm = input[8];

       string hour = string.Concat(input[0], input[1]);

        if(ampm == 'A')

        {

            if (hour == "12")

                sb[0] = sb[1] = '0';

        }

        else if(hour!= "12")

        {

           int num = Convert.ToInt32(hour);

           num =12+num; 

           hour = Convert.ToString(num) ;

           sb[0] = hour[0];

           sb[1] = hour[1];     

        }

            Console.Write(sb.Remove(8,2));

    }

}

​