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: 6, 8, ['J', '4955', '3497', '8869', 'n', '2093', '6249', 'A', '8957']

SOLUTION: A94263902

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: 16, 20, ['r', '7959', '4057', '1617', '1799', '4945', '9271', '9421', 'U', '8075', '9435', 'n', '2749', 'U', 'S', 'D', '7759', '4109', 'T', '1653']

SOLUTION:
3561T90149577D