using static System.Console;
using System.Text;
 
public class Test {
	public static void Main() {
		var texto = "Você chegou em 1º lugar, Parabéns!";
		var novo = new StringBuilder(texto.Length);
		foreach (var c in texto) if ("1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZáéíóúàèìòùâêîôûãõçÁÉÍÓÚÀÈÌÒÙÂÊÎÔÛÃÕÇ ".IndexOf(c) >= 0) novo.Append(c);
		WriteLine(novo);
	}
}
 
//https://pt.stackoverflow.com/q/25924/101

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