using System;
class MainClass {
public static void Main() {
string str1 = "ABCDEabcde1234567890";
string strLow = str1.ToLower();
string strUp = str1.ToUpper();
Console.WriteLine("Lowercase version of str1:\n " + strLow);
Console.WriteLine("Uppercase version of str1:\n " + strUp);
}
}