using namespace std;
 
int main(int argc, char *argv[])
{
  assert(argc==3 && 
    "Usage: <searchstring> replacestring> to process stdin");
  string m_line;
  string m_search(argv[1]);
  string m_replace(argv[2]);
 
  assert(m_search!=m_replace);
 
  while(getline(cin, m_line)) {
      while(true) {
          string::size_type idx = m_line.find(m_search);
          if(idx == string::npos) break;
          m_line.replace(idx, m_search.size(), replace);
      }
      cout << m_line << endl;
  }    
 
  system("PAUSE");	
  return 0;
}

m_line.replace(idx, m_search.size(), m_replace);