using System;

​

public class Program

{

    public static void Main()

    {

        Resolve("QElawYDssEifKfNASJjjVktFSmB | SjflkFYJiaBEQEStVjwKAfDsNsm");

    }

​

    public static void Resolve(string line)

    {

        String[] split = line.Split('|');

        String a = split[0].Trim();

        String b = split[1].Trim();

        int aLen = a.Length;

        int bLen = b.Length;

        int len = aLen < bLen ? aLen : bLen;

        int diff = bLen - aLen;

        int priority = 0;

        for(int i = 0; i < len; i++){

            if (a[i] != b[i]){

                priority++;

            }

        }

        priority += diff;

        if (priority == 0){

            Console.WriteLine("Done");

        }else if (priority <= 2){

            Console.WriteLine("Low");

        }else if (priority <= 4){

            Console.WriteLine("Medium");

        }else if (priority <= 6){

            Console.WriteLine("High");

        }else{

            Console.WriteLine("Critical");

        }

    }

}