/**
knakul853
**/
class Solution {
public:
    string reverseVowels(string s) {

        int i=0;
        int j = (int)s.size()-1;
        string vowels="aeiouAEIOU";

        while(i <j )
        {
            while(i < j &&  vowels.find(s[i]) == string::npos){
                i++;
            }
            while(i < j && vowels.find(s[j])== string::npos) j--;

            if(i < j )
            {
                swap(s[i], s[j]);
            }

            i++;j--;
        }

        return s;
    }
};