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

Answer: H7906H78187843


Question: 5, 5, ['6131', '6209', 'H', 'g', '4529', '491', '2143', '6281']

Answer: 9254


Question: 7, 15, ['8621', 'j', 'K', '5033', '7981', 'j', 'p', '8857', 'E', 'x', '3129', '8795', 'g', 'V', 'T', '3299', 'p', 'C', 'S', '4621', '5611', '2755', 'B', '4195', '7815', '5001']

Answer:
TVg59789213xE7588p