#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
const int maxn = 30;
int cnt[maxn];
int main() {
string str;
memset(cnt, 0, sizeof(cnt));
cin >> str;
int len = str.length();
int ans = 0;
for(int i = 0; i < len; ++i) {
cnt[str[i]-'a']++;
}
for(int i = 0; i < 26; ++i) {
if(cnt[i]) ans++;
}
printf("%s\n", ans % 2 == 0 ? "CHAT WITH HER!" : "IGNORE HIM!");
return 0;
}