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OME 2017 Problem 4

    You are given a row made by 20182018 squares, numbered consecutively from 00 to 20172017 . Initially, there is a coin in the square 00 . Two players AA and BB play alternatively, starting with AA , on the following way: In his turn, each player can either make his coin advance 5353 squares or make the coin go back 22 squares. On each move the coin can never go to a number less than 00 or greater than 20172017 . The player who puts the coin on the square 20172017 wins. ¿Who is the one with the wining strategy and how should he play to win?

    Dataset text AI-MO AoPS. Quoted with source.

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