#include <iostream>
#include <string>

using namespace std;

int main() {
    string word;
    int pos;

    cerr << "Please enter in a word: ";
    getline(cin,word);

    pos=word.find("hi ");

    if(word=="hi")
        cout << "hi to you too" << endl;
    else if(pos!=string::npos)
        cout << "hi to you too." << endl;
    else cout << "I don't understand" << endl;

    return 0;
}