#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
int main() {
int a[30]={0}, cnt=0;
char s[105];
scanf("%s", s);
for(int i=0; i<strlen(s); i++) {
if(a[s[i]-97]==0) cnt++;
a[s[i]-97]++;
}
if(cnt%2==0) printf("CHAT WITH HER!");
else printf("IGNORE HIM!");
return 0;
}
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