using System;
using System.Threading.Tasks;

public class AsyncMethods {
    public async Task FirstMethodAsync() {
    	Console.WriteLine("First async method started.");
        await Task.Delay(3000);
        Console.WriteLine("First async method completed.");
    }
    
    public async Task SecondMethodAsync() {
        Console.WriteLine("Second async method started.");
        await Task.Delay(2000);
        Console.WriteLine("Second async method completed.");
    }
}

public class SyncMethods {
    public void FirstMethod() {
        Console.WriteLine("First sync method started.");
        Task.Delay(3000).Wait();
        Console.WriteLine("First sync method completed.");
    }
    
    public void SecondMethod() {
    	Console.WriteLine("Second sync method started.");
        Task.Delay(2000).Wait();
        Console.WriteLine("Second sync method completed.");
    }
}

public class Program {
    public static async Task Main() {
        AsyncMethods asyncMethods = new AsyncMethods();
        SyncMethods syncMethods = new SyncMethods();
        
        syncMethods.FirstMethod();
        syncMethods.SecondMethod();
        
        Task firstAsyncTask = asyncMethods.FirstMethodAsync();
        Task secondAsyncTask = asyncMethods.SecondMethodAsync();
        
        await Task.WhenAll(firstAsyncTask, secondAsyncTask);
        Console.WriteLine("All methods have completed.");
    }
}