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

SOLUTION: 577559191464579234430269659

PROBLEM: 1, 2, ['L', '7723']

SOLUTION: 3277L

PROBLEM: 6, 17, ['5809', 'o', '1139', '1917', '1075', '911', '4993', 'U', 'm', '8297', 'K', 'q', '6273', '2063', 'J', 'c', '8569', '8591', 'p', 'Z', '5467']

SOLUTION:
9658cJ36023726qK7928mU3994119