Written by Alexey Velikiy, Evgeniy Krasko. APTU 2012.
Usage: rpTask2 <FILE> [EXPR]
Parse definitions from FILE and evaluate EXPR if it is.

example 1: rpTask2 input.txt
example 2: rpTask2 input.txt "{x-> defF x + 1} 2"
In example 2 function defF defined in file input.txt");
with others like this: "defF = {x->x*x}; id={x->x}; pi = 314"