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: 5, 6, ['u', 'O', 'l', '9119', 'P', '6983', 'H', '6701']

SOLUTION: 3896P

PROBLEM: 4, 10, ['L', '6587', 'q', '9569', '6203', '443', '2975', '4641', '9195', '5775', 'y', 'K', '9665']

SOLUTION: 577559191464579234430269659

PROBLEM: 4, 4, ['s', '8929', '1179', '3321']

SOLUTION:
1233