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, 4, ['19', '2669', 'v', 'd', '2221', '4219', 'A', 'P', '7499', 'z', 'm', 'l', '427', 'u']

SOLUTION: dv

PROBLEM: 11, 13, ['h', 's', 'Q', '9071', 'x', 'G', 'G', '1815', '51', 'N', '3541', '1393', '939', '6351', 'w', 'v', '8171']

SOLUTION: 93939311453

PROBLEM: 6, 9, ['7985', 'c', '2895', 'm', 'X', 'E', '2333', '6317', 'x', '3051', '4025', 'g', 'y']

SOLUTION:
x71363332E