What does this code print?

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What does this code print, and why?

using System;

public class A
{
public void F(int i)
{
Console.WriteLine("A: {0}", i);
}
}

public class B: A
{
public void F(object o)
{
Console.WriteLine("B: {0}", o);
}
}

public class Test
{
public static void Main()
{
B b = new B();
b.F(1);

 }
}

what about this code?

using System;

public class A
{
public void F(short i)
{
Console.WriteLine("A: {0}", i);
}
}

public class B: A
{
public void F(int i)
{
Console.WriteLine("B: {0}", i);
}
}

public class Test
{
public static void Main()
{
short val = 15;

  B b = new B();
b.F(val);
}
}