using System.Collections.Generic;
static List<string> data = new List<string> { "2", "frog", "ball", "20"};
public static void Main()
Console.WriteLine("First number: " + data[0]);
Console.WriteLine("First Item: " + data[2]);
int num1 = int.Parse(data[0]);
int num2 = int.Parse(data[3]);
Console.WriteLine("Sum of first two numbers: " + (num1 + num2));