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