#include<iostream>



int main()

{

  std::string s="HAI HOW ARE YOU !";

  int pos=s.find(" ");

  while(pos != std::string::npos)

  {

    s.erase(pos,1);

    s.insert(pos,"20");

    pos=s.find(" ");

  }

  std::cout<<s;

  return 0;

}