let input = 'turpentine and turtles';

const vowels = ['a','e','i','o','u'];

let resultArray =[ ];

for (let i = 0; i < input.length; i++){
  if(input[i] === "e"){
    resultArray.push(input[i]);
  }
   if(input[i] === "u"){
    resultArray.push(input[i]);
  }
  for(let j = 0; j < vowels.length; j++){
    if (input[i] === vowels[j]){
      resultArray.push(input[i]);
    }
  }

};

//console.log(resultArray);

const resultString = resultArray.join('').toUpperCase();
console.log(resultString);