#include<stdio.h>
void main()
{
    printf("Hello world !.. ");
}

#include<iostream>  
using namespace std; 
int main() 
{ 
    cout<<"Hello World!"; 
    return 0; 
}

class HelloWorld 
{
    	public static void main(String args[]) 
    	{ 
    		System.out.println("Hello, World"); 
    	} 
}

using System;
public class Hello 
{
   public static void Main() 
   {
      Console.WriteLine("Hello World!");
      Console.ReadLine();
   }
 }

# This program prints Hello, world!

print('Hello, world!')