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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