#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

int main() {
    int n=1;
    cin >> n;
    cin.ignore(); // must use ignore in c++ before getline or cin.getline

    for(int i=0; i<n; i++) {
        string s[4];

        for(int j=0; j<4; j++) {
            getline(cin, s[j]); //we must use getline because regular cin ends at SPACES. getline includes spaces, until there is a newline \n

            //convert the verses into syllables (vowel + consonant at end)
            for(int k=s[j].length()-1; k>=0; k--) {
                //loops through the end of the word until it reaches a space, vowel, or its at the start at the verse
                char c = tolower(s[j][k]); //must convert to lowercase
                if(c==' ' || k==0 || c =='a' || c =='e' || c =='i' || c =='o' || c =='u') {
                    s[j] = s[j].substr(k); //gets the string starting at the vowel till the end of the verse
                    //convert to lower
                    transform(s[j].begin(), s[j].end(), s[j].begin(), ::tolower); //convert to lowercase
                    break;
                }
            }
        }

        //simple conditionals
        if(s[0]==s[1]&&s[1]==s[2]&&s[2]==s[3]) {
            cout << "perfect" << endl;
        } else if(s[0] == s[2] && s[1] == s[3]) {
            cout << "cross" << endl;
        } else if(s[0] == s[1] && s[2] == s[3]) {
            cout << "even" << endl;
        } else if(s[0] == s[3] && s[2] == s[1]) {
            cout << "shell" << endl;
        } else {
            cout << "free" << endl;
        }

    }


    return 0;
}