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