#include <iostream>
#include <string>
using namespace std;

bool is_vowel(char c) {
    return c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u';
}

bool is_acceptable(const string& s) {
    bool has_vowel = false;
    int vowel_count = 0, consonant_count = 0;

    for (int i = 0; i < s.size(); ++i) {
        if (is_vowel(s[i])) {
            has_vowel = true;
            vowel_count++;
            consonant_count = 0;
        } else {
            consonant_count++;
            vowel_count = 0;
        }

        if (vowel_count >= 3 || consonant_count >= 3)
            return false;

        if (i >= 1 && s[i] == s[i - 1]) {
            if (!(s[i] == 'e' || s[i] == 'o'))
                return false;
        }
    }

    return has_vowel;
}

int main() {
    string word;
    while (cin >> word && word != "end") {
        if (is_acceptable(word))
            cout << "<" << word << "> is acceptable." << endl;
        else
            cout << "<" << word << "> is not acceptable." << endl;
    }
    return 0;
}