#include <iostream>
#include <string>
#include <algorithm>
#include <unordered_set>


int main() {
   std::unordered_set<char> a={'a','e','i','o','O','u','U','A','E','I',' '};

   std::string s="what are you doing";
   
   s.erase( std::remove_if( s.begin(), s.end(), [a] ( char c ){ return a.count(c) == 0; } ), s.end() );

   std::cout<<s << std::endl;
}