use std::io::Read;

fn main(){
    let mut input = "".to_owned();
    std::io::stdin().read_to_string(&mut input).unwrap();
    let mut input = input.split_ascii_whitespace();
    macro_rules! read(($ty:ty) => (input.next().unwrap().parse::<$ty>().unwrap()));
    
    let s=read!(String);
    eprintln!("{s}");
    
    println!("Hello World!");
}