.cs

       abstract class Shape
        {
            public abstract string GetShapeDescription();
        }
        class Rectangle : Shape
        {
            public int Width { get; set; }
            public int Height { get; set; }

            public override string GetShapeDescription()
            {
                return $"Found { Height }x { Width} rectangle";
            } 
        }

        class Circle : Shape
        {
            public int Radius { get; set; }
            public override string GetShapeDescription()
            {
                return $"found a circle with radius { Radius}";
            }
        }