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

SOLUTION: H7906H78187843

PROBLEM: 1, 3, ['5231', 'n', '6293', '4509', 'w', '545', '4403', '961', '3213', 'y', '715', 'Z', 'd', 'O', 'U', 'e', 'L', '8375']

SOLUTION: 3926n1325

PROBLEM: 19, 26, ['7711', '3883', 'p', '939', 'h', 'h', 'X', '3559', 'Y', '595', 'e', 'J', '9223', 'V', '115', '9259', '8495', 'w', 'X', '9307', 'T', '4485', 'Y', 'C', '3733', 'm', 'W']

SOLUTION:
m3373CY5844T7039X