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: 5, 6, ['A', 'v', 'x', '2047', '5955', 'l', '4845', '1347', 'i', 'm', 'W', 'h', 'w', '4483', '1509']

SOLUTION: l5595

PROBLEM: 4, 16, ['M', '1253', 'L', '1997', 'E', 'u', '4953', '1627', '4497', '1839', 'M', 's', '9821', '9159', '845', '6189', 'F', 'G', 'E', '2303', '503']

SOLUTION: 981654895191289sM9381794472613594uE7991

PROBLEM: 2, 6, ['y', 'C', '7991', 'K', '3391', '29']

SOLUTION:
921933K1997C