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: 13, 20, ['8627', '7993', 'N', 'p', 'n', 'v', 'T', 'L', 'z', '2929', 'a', 'D', '8465', 'R', '8803', 'q', '1069', 'p', '7231', '9581', '1689', 'b', '8773', 'P', 'a', 'L', 't']

SOLUTION: 18591327p9601q3088R5648

PROBLEM: 2, 9, ['g', '309', 'x', '3537', '5995', 'K', '6951', 'x', 'b', '3171', '9079', '7597']

SOLUTION: bx1596K59957353x903

PROBLEM: 3, 14, ['j', 'f', 'l', '8785', '4713', 'o', 'q', 'W', 'U', '1529', '2677', '9809', 'd', 's', '3657', 'x', '6227', 'U', 'N', '2719', 'H']

SOLUTION:
sd908977629251UWqo31745878l