using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine(add('a', 'b'));

        Console.WriteLine(add("apple", "pear"));

    }

    static int add(char a, char b)

    {

        var c = a + b;

        return c;

    }

    static int add(string a, string b)

    {

        var c = (a + b).Select(f=>(int)f).Sum();

        return c;

    }

}