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, 21, ['V', '3661', '3743', 'Y', '3179', 'b', '7097', '3031', '5859', '4095', 'D', 'J', '2337', '4259', '2539', 'I', '9659', 'U', 'G', 'Q', '3145', '177', '9839', 'f']

SOLUTION: 5413QGU9569I935295247332JD5904958513037907b9713Y3473

PROBLEM: 5, 8, ['9889', 'z', '895', 'W', 'j', 'K', '7047', '9723', '6281']

SOLUTION: 32797407Kj

PROBLEM: 11, 27, ['2481', '4889', 'l', 's', '6371', '4757', '9599', '845', '2711', '6151', '281', '7383', 'J', 'x', 'x', 'W', 'X', 'J', '3199', 'i', '521', 'V', 'q', 'Q', 'k', '517', '2153']

SOLUTION:
3512715kQqV125i9913JXWxxJ3837182