#include <bits/stdc++.h>
using namespace std;
int main() {
  char ch[105];
  int l, k, arr[28] = {0};
  cin >> ch;
  l = strlen(ch);
  int i, count = 0;
  for (i = 0; i < l; i++) {
    arr[ch[i] - 'a']++;
  }
  for (i = 0; i < 27; i++) {
    if (arr[i] != 0) count++;
  }
  if (count % 2 == 0)
    cout << "CHAT WITH HER!" << endl;
  else
    cout << "IGNORE HIM!" << endl;
  return 0;
}
