#include <bits/stdc++.h>
int main() {
  char w[101];
  scanf("%s", w);
  int i, r, count, d, k;
  count = 0;
  d = strlen(w);
  for (r = 1; r < d; r++) {
    for (i = 0; i < r; i++) {
      if (w[i] == w[r]) {
        count += 1;
        break;
      }
    }
  }
  k = d - count;
  if (k % 2 == 0) {
    printf("CHAT WITH HER!\n");
  } else
    printf("IGNORE HIM!\n");
  return 0;
}
