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!");
        }
    }
}