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: 16, 16, ['7539', 'A', '8589', 'T', 'Q', 'u', 'z', 'A', '9751', '2913', '7453', '5649', 'Q', 'H', 'Z', 'O', 'v', 'V']

SOLUTION: O

PROBLEM: 2, 2, ['a', 'J']

SOLUTION: J

PROBLEM: 12, 25, ['S', '9729', 'N', 'C', 'e', '3873', '8511', 'H', '2809', '9049', '489', '7795', 'R', 'F', '7307', 'g', '409', 'x', 'D', 'e', 'm', '5213', '8109', 'm', '2159', '6689', 'r', 'r', 'r']

SOLUTION:
9512m90183125meDx904g7037FR5977