using System;
using System.Collections.Generic;

namespace /* TODO: your namespace goes here */ {
    class MyStack {
        private int[] stack = new int[100];
        private int top = 0;

        public void Push(int value) {
            // TODO: Add a value to the stack
        }

        public int Pop() {
            // TODO: Get the last item and remove it from the array
        }

        public int Peek() {
            // TODO: Get the last item without removing it
        }

        public int Count() {
            // TODO: Return the number of items
        }

        public bool IsEmpty() {
            // TODO: Return true when empty and false otherwise.
        }

        public bool IsFull() {
            // TODO: Return true when full and false otherwise.
        }

        public void PrintData() {
            for (int i = 0; i < top; i++) {
                Console.Write(stack[i] + " ");
            }
            Console.WriteLine();
        }
    }

    class Program {
        static void Main(string[] args) {
            MyStack stack = new MyStack();

            stack.Push(1);
            stack.PrintData();

            stack.Push(2);
            stack.PrintData();

            stack.Push(3);
            stack.PrintData();

            Console.WriteLine("Pop(): " + stack.Pop());
            stack.PrintData();
            
            Console.WriteLine("Pop(): " + stack.Pop());
            stack.PrintData();

            stack.Push(4);
            stack.PrintData();

            Console.WriteLine("IsEmpty(): " + stack.IsEmpty());
            Console.WriteLine("IsFull(): " + stack.IsFull());

            /**
            * Expected Output
            * 1
            * 1 2
            * 1 2 3
            * Pop: 3
            * 1 2
            * Pop: 2
            * 1
            * 1 4
            */
        }
    }
}