Given N strings, choose the maximum number of strings such that in the overall chosen string\'s, each letter\'s count is even.\n\n```\n1 <= N <= 15\nAll letters are uppercase\n```\n\n```\nInput\nN = 5\nStrings:\nABAB\nABF\nCDA\nAD\nCCC\n\nOutput:\n1,3,4,5\n\nExplanation:\nChoose the strings with index 1,3,4 and 5\n```\n\nHow do you solve this question?

Given N strings, choose the maximum number of strings such that in the overall chosen string\'s, each letter\'s count is even.\n\n\n1 <= N <= 15\nAll letters ar