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: 3, 15, ['5807', 'M', 'A', 'm', '4557', 'P', 'y', '2895', 'K', 'K', '5379', '2367', 'M', '8653', '3847', 'D', '7725', '6571', 'L', '2011', 'h']

SOLUTION: 74833568M76329735KK5982yP7554mA

PROBLEM: 5, 5, ['7991', '8029', '9605', 'u', '9539', 'q', '3789', 'i', '8639', '7477']

SOLUTION: 9359

PROBLEM: 1, 12, ['q', 'f', 'h', '5145', '367', 'm', 'k', 'p', '4669', '8885', '5269', 'h', '2115']

SOLUTION:
h962558889664pkm7635415hfq