/*if the string contains equal number of uppercase and lowercase letters, convert the string to lowercase.*/

function solve(s){
    //..
  let upperCount = 0;
  for(let i = 0; i < s.length; ++i){
    if(s[i] != s[i].toLowerCase()){
      upperCount++;
      if(upperCount > s.length / 2){
        return s.toUpperCase();
      }
    }
  }
  return s.toLowerCase();
}