#include <iostream>
#include <fstream>
#include <string>

using namespace std;

int main()
{ ifstream fi;
  fi.open("mystery.dat", ios::in | ios::binary);
  for (int r = 0; r < 600; r += 1)
  { short int d[600];
    fi.read((char *) d, sizeof(d));
    for (int c = 0; c < 600; c += 4)
      if (d[c] == -500)
        cout << "@";
      else
        cout << ".";
    cout << "\n"; }
  fi.close(); }