#include <iostream>

int main() {
    std::cout << "Hello world!" << std::endl;
    std:: cout<< " hello " << std::endl;
    std:: cout << "hello" << std::endl;
    std:: cout << "hello" << std::endl;
    std:: cout <<"seeyou soon " << std::endl;
    std:: cout << "thanks" << std::endl;
    return 0;
}