using System;

​

// Characters in a string are numbered starting from 0.

// So in this case "a" is at index 0, and "z" is at index 25

string alphabet = "abcdefghijklmnopqrstuvwxyz";

​

// `.Substring` takes a starting index and the length of what 

// you want to include to the right

string firstThird = alphabet.Substring(0, 8);

string secondThird = alphabet.Substring(8, 8);

​

// if you leave out the second argument (the length), it will

// go to the end

string thirdThird = alphabet.Substring(17);

​

Console.WriteLine("First Third: " + firstThird);

Console.WriteLine("Second Third: " + secondThird);

Console.WriteLine("Third Third: " + thirdThird);