static void Main(string[] args)
{
string s = Console.ReadLine();
Regex lower = new Regex("[a-z]");
Regex upper = new Regex("[A-Z]");
int low = lower.Matches(s).Count;
int up = upper.Matches(s).Count;
if(up > low)
Console.WriteLine(s.ToUpper());
else
Console.WriteLine(s.ToLower());
Console.ReadLine();
}