#include <bits/stdc++.h>
using namespace std;
int h[30];
char s[1005];
int main() {
  scanf("%s", s);
  int i = 0;
  while (s[i]) {
    h[s[i++] - 'a']++;
  }
  int n = 0;
  for (int i = 0; i < 26; i++)
    if (h[i]) n++;
  if (n % 2)
    printf("IGNORE HIM!");
  else
    printf("CHAT WITH HER!");
  return 0;
}
