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.

17, 21, ['5503', '2979', '6307', '633', 'n', '9339', '5829', '5291', '8967', 'i', '9063', '975', 'G', '9187', '3227', 'A', '3487', '8187', 'H', '6097', 'H']
H7906H78187843

2, 7, ['P', 'Q', 'i', '1593', 'M', '8577', 'd', 'Y']
d7758M3951iQ

13, 13, ['3163', 'K', '8005', '6891', 'E', 'R', '2759', 'G', '5017', 'J', 'n', 'g', '2979', '2515', 'q', '1429', '4689', '4249', '4627', 'P', '4371', '8321', '7795', '43', 'l']

9792