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: 2, 18, ['8671', 'd', '5109', '1915', 'h', '2777', '3087', '9861', '8597', 'P', '4505', 'j', 'M', 'O', 's', 'Q', '2703', 'X', 'l', 'g', '1801']

SOLUTION: X3072QsOMj5054P7958168978037772h51919015d

PROBLEM: 3, 12, ['2159', 'f', 'u', '2675', '7357', '9325', '1275', '8897', 'I', '2095', '5835', '577', 'g', '2783', '7843', '8517', '4185', '5847', '2645', '2357', 'l', 'v', '2239', '141', 'o', '2529', '7977', '8445', '2363']

SOLUTION: 77553855902I79885721523975375762u

PROBLEM: 9, 15, ['4895', '5675', '3137', 'x', '9883', 'S', 's', 'S', '797', 'p', '285', 'c', '3737', 'h', '8219', 'i', 'M', '7547', 'K', '953', '9183', '4815', 'V', '7231', 'A', '9731', '3309', '657', 'j', '7937']

SOLUTION:
9128h7373c582p797