#include <bits/stdc++.h>
using namespace std;
int main() {
  char arr[10000], b;
  cin >> arr;
  int x, arr2[1000];
  fill(arr2, arr2 + 1000, -1);
  x = strlen(arr);
  for (int w = 0; w < x; w++) {
    b = arr[w];
    ++arr2[b];
  }
  int m = 0;
  sort(arr2, arr2 + 1000);
  reverse(arr2, arr2 + 1000);
  for (int w = 0; w < 1000; w++) {
    if (arr2[w] > -1) ++m;
  }
  if (m % 2 == 0)
    cout << "CHAT WITH HER!";
  else
    cout << "IGNORE HIM!";
}
