instruction:
In this task, you are given inputs 'i', 'j', and A, where 'i' and 'j' are integers and A is a list. A list is shown by two brackets and comma-separated numbers and characters inside, like ['1', '12', 'l']. You need to concatenate all elements of A from the ith element to the jth element, and then reverse the resulting string. 'i' and 'j' will be non-negative, and will always have a value less than the length of A. 'i' will always be less than 'j'. Perform the operations in order, i.e., do not reverse first and then concatenate.
question:
4, 16, ['S', '5719', '173', 'P', 'a', '5791', 'e', '6279', 'q', '2585', '9533', 'r', '849', 'h', '3259', '3707', '4939', 'X', 'e']
answer:
70739523h948r33595852q9726e1975aP


question:
14, 15, ['3351', '8899', 'M', 'm', '2939', 'e', '1681', '9189', 'b', 'j', 'L', '1927', '2855', '2993', 'F', 'P', '3261', '3185', 'U', '8887', 'M', '9865']
answer:
F3992


question:
1, 2, ['4891', '6669', 'b', '2655', '4531', '4395', '4847', '3809', 'Y', '2617', '2871']
answer:

96661984