Elitmus Exam Coding Decoding

Q. Please explain I don't understand this question
C O W *
O N E
--------
N N R C
O O V R-
D E C D--
-----------
W O R O N C

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@ N ARUN:
C O W *
O N E
--------
N N R C
O O V R-
D E C D--
-----------
W O R O N C
Q. (999^x -999^y)/1000
what are the max number of remender including 0.x and y can be any natural number