using System;
using System.Linq;
 
class Program
{
    static string RemoveDuplicates(string input)
    {
        return new string(input.ToCharArray().Distinct().ToArray());
    }
 
    static void Main()
    {
        string input = RemoveDuplicates(Console.ReadLine());
 
        if (input.Length % 2 == 0)
        {
            Console.WriteLine("CHAT WITH HER!");
        }
        else
        {
            Console.WriteLine("IGNORE HIM!");
        }
    }
}

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