using System;
using System.Collections.Generic;
using System.Linq;
public class Test
{
public static void Main()
{
Console.WriteLine(new String("AB12 9HG".TakeWhile(p => Char.IsLetter(p)).ToArray()));
Console.WriteLine(new String("PJ11".TakeWhile(p => Char.IsLetter(p)).ToArray()));
Console.WriteLine(new String("123JO".TakeWhile(p => Char.IsLetter(p)).ToArray()));
}
}
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