#include <iostream>
#include <vector>
using namespace std;
 
int main() {
 
	string s;
	vector<char> chars;
	int counter=0;
	int innerCounter =0;
 
	cin>>s;
 
	chars.push_back(s[0]);
	for (int y=1 ; y<s.size() ; y++)
	{   
		for (int r=0; r<chars.size();r++)
		{
				if(chars[r]==s[y])
				{
					break;
				}
				innerCounter++;
 
 
		}
		if (innerCounter==chars.size())
		{
			counter++;
			innerCounter=0;
			chars.push_back(s[y]);
		}
 
	}
	if (counter%2==0)
		cout<<"CHAT WITH HER!";
	else
		cout<<"IGNORE HIM!";
	return 0;
}

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c2V2ZW5rcGx1cw==

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