using System;
using System.Text;
using System.Text.RegularExpressions;
using System.Globalization;
using System.Linq;
 
public class Program
{
	public static void Main()
	{
		string rawInput = "ἀἁἂἃἄἅἆἇὰάᾀᾁᾂᾃᾄᾅᾆᾇᾰᾱᾲᾳᾴᾶᾷᾶ";
		Console.WriteLine(rawInput);
		string normalizedInput = Utility.RemoveDiacritics(rawInput);				
 
		string pattern = "α+";
 
        var result = Regex.Matches(normalizedInput, pattern);
		if(result.Count > 0)
			Console.WriteLine(result[0]);
 
	}
}
 
public static class Utility
{
    public static string RemoveDiacritics(this string str)
    {
        if (null == str) return null;
        var chars =
            from c in str.Normalize(NormalizationForm.FormD).ToCharArray()
            let uc = CharUnicodeInfo.GetUnicodeCategory(c)
            where uc != UnicodeCategory.NonSpacingMark
            select c;
 
        return new string(chars.ToArray()).Normalize(NormalizationForm.FormC);
    }
 
}
 

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