Zadatak 11.

#include <bits/stdc++.h>

using namespace std;

int main() {

    string s;
    cin >> s;
    int n = s.size();
    for(int i = 0; i < n; i++){
            s[i] = tolower(s[i]);
           if (s[i]=='a' || s[i]=='e' || s[i]=='i' || s[i]=='o' || s[i]=='u'){
                s[i]= toupper(s[i]);
           }
    }
    cout << s << endl;
    return 0;
}