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    Step 1: Solve it like a noob Step 2: Be the 'Ok guy'

        # count = 0
        # for day in range(i, j+1):
        #     if (day-int(str(day)[::-1])) % k == 0:
        #         count += 1
        # return count
        
        return sum((day-int(str(day)[::-1])) % k == 0 for day in range(i, j+1))