#include <bits/stdc++.h>
using namespace std;
char s[10010];
int a[27];
int main() {
  while (~scanf("%s", s)) {
    memset(a, true, sizeof(a));
    int cnt = 0;
    int len = strlen(s);
    for (int i = 0; s[i]; i++) {
      if (a[s[i] - 97]) {
        a[s[i] - 97] = false;
      }
    }
    for (int i = 0; i < 27; i++) {
      if (!a[i]) cnt++;
    }
    if (cnt % 2 != 0)
      printf("IGNORE HIM!\n");
    else
      printf("CHAT WITH HER!\n");
  }
  return 0;
}
