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: 30, 30, ['t', 'W', 'P', '7193', '913', 'j', 'Y', '9535', '7771', 'R', '9275', '7115', '3433', '5279', 'T', '8899', '9497', 'U', '3461', '1753', 'k', 'T', '7899', '6963', '9271', '9173', '3357', '3521', '7397', 'r']

SOLUTION: r

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

SOLUTION: l5595

PROBLEM: 14, 20, ['9859', 'B', '8527', '8209', '9857', '4501', '4835', 'J', '6205', '1437', '4669', 'U', 'n', '1057', 'B', '1835', 'L', 'O', 'f', 'y', 'y', 'O', 'i', '7929', 'F', '8331', '7413', 'w']

SOLUTION:
yfOL5381B7501