':type nums: List[int]
:rtype: List[int]'

def findDisappearedNumbers(self, nums):

    for i in xrange(len(nums)):
        if (nums[(abs(nums[i]) - 1)] > 0):
            nums[(abs(nums[i]) - 1)] *= (-1)
    result = []
    for i in xrange(len(nums)):
        if (nums[i] > 0):
            result.append((i + 1))
        else:
            nums[i] *= (-1)
    return result
