using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(('c' - 'a'));

    }

    static string twoStrings(string s1, string s2) {

        // loop through each string and compare characters at same position

        // if don't match move to next otherwise they have a common substring

        for (int i = 0; i < s1.Length; i++) {

            for (int j = 0; j < s2.Length; j++) {

                if (s1[i] == s2[j]) {

                    return "YES";               

                }

            }

        }

        return "NO";

​

    }

}