Write a Thrax grammar that adds 4 to a non-negative integer (in decimal
notation).
Napisz gramatykę Thraxową, która do liczby nieujemnej (w zapisie
dziesiętnym) dodaje 4.

Hints:
- easier to define reverted automaton and then use Reverse
- consider two cases: adding with carry and without
- be careful with sequences of nines
- sometimes the result will one digit longer

POINTS: 2
DEADLINE: 2020-01-20 18:50