#include <bits/stdc++.h>
using namespace std;
int main() {
  int l, i, cnt = 0;
  char s[101];
  scanf("%s", &s);
  l = strlen(s);
  sort(s, s + l);
  for (i = 0; i < l; i++) {
    if (s[i] != s[i + 1]) cnt++;
  }
  if (cnt % 2 == 1)
    printf("IGNORE HIM!\n");
  else
    printf("CHAT WITH HER!\n");
  return 0;
}
