236A - Boy Or Girl

using namespace std;
int main(void)
{
    string s;
    vector<bool> alph(26, false);
    string msg[2] = {"CHAT WITH HER!", "IGNORE HIM!"};
    cin >> s;
    for (auto c : s)
        alph[c - 'a'] = true;
    bool ans = accumulate(alph.begin(), alph.end(), 0) % 2;
    cout << msg[ans] << endl;
    return 0;
}