using System;
using  System.Text.RegularExpressions;
 
public class Test
{
	public static void Main()
	{
		Console.WriteLine(Regex.IsMatch("abc123", "^.[pr]|[A-Za-z]$"));
    	Console.WriteLine(Regex.IsMatch("abc12x", "^.[pr]|[A-Za-z]$"));
    	Console.WriteLine(Regex.IsMatch("apc123", "^.[pr]|[A-Za-z]$"));
    	Console.WriteLine(Regex.IsMatch("arc123", "^.[pr]|[A-Za-z]$"));
    	Console.WriteLine(Regex.IsMatch("", "^.[pr]|[A-Za-z]$"));
	}
}

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