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: 20, 22, ['4065', 'I', '7721', 'x', '8903', 'S', '8877', 'W', 'j', '1835', '6933', '549', '7799', '8789', 'c', 'M', '6183', '3319', 'h', '8551', 'r', '2957', 'o', 'W', '9497', 'j', 'g', '3619']

SOLUTION: 7592r1558

PROBLEM: 7, 8, ['U', 't', '8289', '9391', '1751', 'Y', '9319', 'A', 'Q', 'd', 'B', '2521', '2455']

SOLUTION: A9139

PROBLEM: 7, 23, ['2217', 'K', '2733', '5903', 'u', '2795', 'p', '4463', 'j', '695', 'r', 'R', 'C', 'e', 'e', '1111', 'T', '5753', '5079', '6399', 'k', '7415', '2895', 'u', 'e', '9299', '6893']

SOLUTION:
59825147k993697053575T1111eeCRr596j3644p