#include <iostream>
#include<cstring>
using namespace std;
int main() {
int a[26];
for(int i=0;i<26;i++)
{
a[i]=0;
}
string s;
cin>>s;
int count=0;
for(int i=0;i<s.size();i++)
{
a[s[i]%97]++;
}
for(int i=0;i<26;i++)
if(a[i]!=0)
count++;
if(count%2==0)
cout<<"CHAT WITH HER!";
else
cout<<"IGNORE HIM!";
return 0;
}
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