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: 17, 21, ['5503', '2979', '6307', '633', 'n', '9339', '5829', '5291', '8967', 'i', '9063', '975', 'G', '9187', '3227', 'A', '3487', '8187', 'H', '6097', 'H']

SOLUTION: H7906H78187843

PROBLEM: 22, 29, ['7033', 'L', '8085', '9405', 'w', '9699', 'Y', 'w', 'J', '5543', '3967', 'B', '7289', '2385', '9123', 'M', 'o', '3055', 'b', '7955', '5857', 'N', 'l', '5075', 'H', '6681', '3289', '2135', '3593']

SOLUTION: 3953531298231866H5705lN

PROBLEM: 7, 7, ['9801', '3723', '6757', 'i', '5353', 'J', 'G', '811']

SOLUTION:
G