Jose and Maria play the following game: Maria writes 2019 positive integers different on the blackboard. Jose deletes some of them (possibly none, but not all) and write to the left of each of the remaining numbers a sign +or a sign ā. Then the sum written on the board is calculated. If the result is a multiple of 2019, Jose wins the game, if not, Maria wins. Determine which of the two has a winning strategy. combinatoricswinning strategy