using System;               

public class Program

{

    public static void Main()

    {

              string str = Console.ReadLine(); 

               int ans = UserProgramCode.validateTime(str); 

                if (ans == 1) 

                   Console.WriteLine("Valid time format"); 

                else if (ans == -1) 

               Console.WriteLine("Invalid time format"); 

     } 

} 

class UserProgramCode 

{ 

            public static int validateTime(string str) 

           { 

           int hr, min; 

             hr = int.Parse(str.Substring(0,2)); 

          min = int.Parse(str.Substring(3,5)); 

              string suf = str.Substring(6); 

           if (hr > 12 || min > 60 || suf != " am" && suf != " pm") 

             return -1; 

             else 

            return 1; 

            } 

} 

​

​