#include <iostream>
#include <string>
using namespace std;

string addInplaceOfSpaces (string &s) {
  string temp = "";
  for (int i = 0; i < s.length(); i ++) {
    if (s[i] == ' ') {
      temp.push_back('@');
      temp.push_back('2');
      temp.push_back('3');
    }
    else {
      temp.push_back(s[i]);
    }
  }
  return temp;
}

int main() {
  string s ="my name is vishnu deb jha" ;
  string v = addInplaceOfSpaces(s);
  cout << v << endl;
  return 0;
}
// output is my@23name@23is@23vishnu@23deb@23jha