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, 4, ['I', 'i', 'b', '2703']

SOLUTION: 3072

PROBLEM: 2, 5, ['6345', '7381', 'm', '5685', '3267', '9841', '9719', 'N', 'e', '1455', 'i', '3989', '3285', '9257', 'u', '8547', '1799']

SOLUTION: 76235865m1837

PROBLEM: 5, 11, ['773', '5575', 'n', '7275', 'R', '5183', 'A', '8791', 'A', '963', '5701', '6571', '4145', 'l', 'X', '8513', '4927', '5347', 'T', '3211', 'X', 'v', '527', 'p', '5535', 'l', '2223', '5821']

SOLUTION:
1075369A1978A3815R