using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(Validate_Cc("456/12"));

        Console.WriteLine(Validate_Cc("25/1"));

        Console.WriteLine(Validate_Cc("1/23"));

        Console.WriteLine(Validate_Cc("/"));

        Console.WriteLine(Validate_Cc("A324/1"));

        Console.WriteLine(Validate_Cc("458/P8"));

    }

    public static string Validate_Cc(string courtCase)

    {

        string[] parts = courtCase.Split('/').Select(x => string.IsNullOrEmpty(x) ? "0" : x).ToArray();

        if(int.TryParse(parts[0], out int number1) && int.TryParse(parts[1], out int number2))

            return $"{number1:0000}/{number2:00}";          

        else

            return BadLines(courtCase);

    }

    public static string BadLines(string courtCase)

    {

        return "FORMAT ERROR";

    }

}