#include <stdio.h>
#include <string.h>
int main()
{
    char str[150];
    int arr[35];
    memset(str, 0, sizeof(str));
    memset(arr, 0, sizeof(str));
    scanf("%s", str);
    int i;
    int ans=0;
    for(i=0; str[i]!=0; ++i)
    {
        ++arr[str[i]-'a'];
        if(arr[str[i]-'a']==1)
            ++ans;
    }
    if(ans%2==0)
        printf("CHAT WITH HER!\n");
    else
        printf("IGNORE HIM!\n");
}