using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        Regex regexp = new Regex("[a-zA-Z]");

        Console.WriteLine(regexp.Match("441-16C00053").Success);

        Console.WriteLine(regexp.Match("441-1600053").Success);

        Console.WriteLine(regexp.Match("441-1600053a").Success);

        Console.WriteLine(regexp.Match("h441-1600053").Success);

    }

}