#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  while (cin >> s) {
    int i = 0, j = 0, q = 1;
    while (s[i] != NULL) {
      int p = i;
      while ((p - 1) >= 0) {
        if (s[p - 1] == s[i]) {
          q = 0;
          break;
        } else
          q = 1;
        p--;
      }
      if (q == 1) j++;
      i++;
    }
    if (j % 2 == 0)
      cout << "CHAT WITH HER!" << endl;
    else
      cout << "IGNORE HIM!" << endl;
  }
  return 0;
}
