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

int main() {
    string str;
    getline(cin, str);
    
    for (char ch : str) {
        if (!isalpha(ch) && ch != ' ') {
            cout<<"Invalid input";
            return 0;
        }
    }
    string result = "";
    
    for (char ch : str) {
        char lower = tolower(ch);
        if(lower != 'a' && lower != 'e' && lower != 'i' && lower != 'o' && lower != 'u') {
    }
     cout<< result;
     return 0;
}