using System;
 
public class Program
{
	public static void Main()
	{
		var child = new Child();
		child.A = 3;
		Console.WriteLine(child.A); //Нужно чтобы вывело 3
	}
}
 
public class Base 
{
	private int a;
 
	public virtual int A{
		get {
			return a;
		}
 
		set {
			a = 5;
		}
	}
}
 
public class Child:Base
{
	public override int A{
 
		set {
			//Тут нужно что-то сделать
		}
	}
}
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