On my boring (No food, no TV) flight from Krakow to Paris I have created, solved and debugged the following alphametics:
POLSKA + KRAKOW = ANSWER.

Apparently there are 2 possible solutions.
a. (D2) Find both.

b. (D4) What is the maximum value of POLSKA + KRAKOW if the digits corresponding to the word POLSKA form a square number?

Rem : Each letter corresponds to a certain digit (distinct in each case) - other than that there are no restrictions.