An addition program.

The program adds two numbers.
  A number 'n' is represented by n 1-s.
  Sample :
    5 is represented as 11111
    3 is represented as 111

  Input : Two numbers separated by symbol '*'
  Sample :
    11111*111

  Output : Resulting number (without '*') preceded by left-side-marker
  Sample :
    x11111111

  Left-side-marker is first symbol of internal symbol alphabet.

The program contains 2 (user-defined) check points.
The program contains no daemon-defined rules.
