#include <bits/stdc++.h>
#include <time.h>
using namespace std;
#define CIN(x) for(auto &i : x) \
cin>>i;
#define deb(x) cout<<#x <<' '<<x<<nl;
#define ios ios::sync_with_stdio(0); \
cin.tie(0);\
void read(){
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
}
//////////////////////////////////////////////////
const int INF = INT_MAX;
int freq[26];
void solve(){
string s; cin>>s;
int ans = 0;
for(int i = 0 ; i < (int)s.size() ; ++i){
freq[s[i] - 'a'] += 1;
if(freq[s[i]-'a'] == 1)
++ans;
}
if(ans % 2 == 0){
cout<<"CHAT WITH HER!"<<'\n';
}
else{
cout<<"IGNORE HIM!"<<'\n';
}
}
int main(){ ios
// read();
int tt = 1;
//cin>>tt;
for(int t = 1 ; t <= tt ; ++t){
solve();
}
return 0;
}
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