using System;
using System.Collections.Generic;
using System.Linq;
 
public class Test
{
 
	public static void Main()
	{
            string A = "1 2 3A 4 5C 6 ABCD EFGH 7 8D 9";
            string[] words = A.Split();
            string result = string.Join(" ", 
                words.Select(w => w.Any(c => Char.IsDigit(c)) ? 
                   new string(w.Where(c => Char.IsDigit(c)).ToArray()) :  w)
                     .ToArray());
        Console.Write(result);
	}
}

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