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.

[EX Q]: 2, 19, ['C', 'D', 'C', 'Z', '3843', 'j', 'T', 'o', '9147', '2915', 'n', 'N', '939', 'S', '2457', '7789', 's', 'z', 'V']
[EX A]: Vzs98777542S939Nn51927419oTj3483ZCD

[EX Q]: 1, 9, ['g', '3007', '4827', '6665', '711', '6997', '137', 'X', '7383', 'q', 'v', 'K', '267', '3691', 'G', '7925', '8327', 'l']
[EX A]: 3837X7317996117566672847003g

[EX Q]: 19, 20, ['S', '7201', '3491', '4669', '1481', '3437', 'k', 'P', '9245', '1845', 'f', 'I', 'Z', 'K', 'l', '1845', 'H', '4341', '9133', '6627', 'F']
[EX A]:
72663319