using System;
using System.Collections.Generic;
 
class ProgrammingLanguagesQueue
{
    public static void Main()
    {
        // Create a queue representing languages to learn in order
        Queue<string> learningQueue = new Queue<string>();
 
        Console.WriteLine("Programming Languages Learning Queue (FIFO):");
        Console.WriteLine("============================================");
 
        // Add languages to the learning queue
        learningQueue.Enqueue("HTML/CSS");
        learningQueue.Enqueue("JavaScript");
        learningQueue.Enqueue("Python");
        learningQueue.Enqueue("Java");
        learningQueue.Enqueue("C#");
        learningQueue.Enqueue("React");
 
        Console.WriteLine("\nCurrent languages in my learning queue:");
        foreach (string language in learningQueue)
        {
            Console.WriteLine(language);
        }
 
        Console.WriteLine("\nNumber of languages in queue: " + learningQueue.Count);
 
        // Simulate completing the first language (HTML/CSS)
        Console.WriteLine("\nCompleted learning: " + learningQueue.Dequeue());
 
        Console.WriteLine("\nUpdated learning queue after completing HTML/CSS:");
        foreach (string language in learningQueue)
        {
            Console.WriteLine(language);
        }
 
        // Check if queue contains specific languages
        Console.WriteLine("\nQueue contains Python: " + learningQueue.Contains("Python"));
        Console.WriteLine("Queue contains PHP: " + learningQueue.Contains("PHP"));
 
        // Simulate completing another language
        Console.WriteLine("\nCompleted learning: " + learningQueue.Dequeue());
 
        Console.WriteLine("\nFinal learning queue:");
        foreach (string language in learningQueue)
        {
            Console.WriteLine(language);
        }
 
        Console.WriteLine("\nRemaining languages to learn: " + learningQueue.Count);
    }
}

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