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: 8, 19, ['r', '7451', 'X', 'l', 'S', 'v', '4807', '4851', '8849', '3993', 'w', 'Z', '1419', '9185', 'N', '2285', '13', 'm', 'd', 'Y', 'j']

SOLUTION: dm315822N58199141Zw399394881584

PROBLEM: 1, 3, ['o', 'o', '4511', '9203', '6071', 'Q', '5337']

SOLUTION: 1154oo

PROBLEM: 4, 7, ['t', '5305', 'a', '7775', '923', 'R', '4209', '7257', 'B', '5193', 'G', 'y', 'H', '9195', 'Q', '6129', 'M']

SOLUTION:
9024R3295777