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: 4, 4, ['Z', '7465', 'J', 'W']

SOLUTION: W

PROBLEM: 1, 4, ['B', '5591', '1237', '1519']

SOLUTION: 915173211955B

PROBLEM: 1, 25, ['3541', 'P', '9173', 'a', 'e', '7121', 'O', '8587', '8979', '6131', 'J', 'T', '4533', 'v', '6339', 'V', 'z', 'E', '4099', '5181', '5779', '841', '3715', '7791', 'E', 'C', '265', '1605']

SOLUTION:
E19775173148977518159904EzV9336v3354TJ131697987858O1217ea3719P1453