#include<iostream>
#include<string>
#include<cctype>
using namespace std;
int main(){
    string strl
    getline(cin,str);
    
    for (char c : str) {
        if (!isalpha(c) && c != ' ') {
            cout << "Invalid input";
            return 0;
        }
    }
    string result = "";
    for (char C : str) {
        char lower = tolower(c);
        if (lower != 'a' && lower != 'e' && lower ! = 'i' &&
            lower != 'o' && lower != 'u') {
                
            }
    }
    cout << result;
    return 0;
}