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#include<bits/stdc++.h>
using namespace std;

int main(){ 
  string str; 
  int count; 
  getline(cin,str);
  int temp=0;

  //Counts each character present in the string 

  int l=str.length();
  for(int i = 0; i <l; i++) { 
    count = 1; //Updates the count again to 1 for every new character

    for(int j = i+1; j < l; j++) {
      if(str[i] == str[j] && str[i] != ' ') { 
      count++; 
     //Set string[j] to 0 to avoid printing the visited character 
     str[j] = '0'; 
    } 
  }

  //A character is considered as duplicate if count is greater than 1

  if(count > 1 && str[i] != '0') 
    temp++; 
  }
  //cout<< temp<<'\n';
  int acstr= str.size()-temp;
  if(acstr%2==0){
    cout<<  "CHAT WITH HER!"<< endl;
  }
  else{
    cout<< "IGNORE HIM!"<< endl;
  }
  return 0; 
 }