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, 7, ['C', 'j', 'F', '495', 'H', '6595', 'h', '7567', 'f']

SOLUTION: h5956H594

PROBLEM: 5, 12, ['t', '4541', 'z', 'K', 'b', 'E', '3395', 'z', '4511', 'F', '7085', '3753', 'n', 'W', 'J']

SOLUTION: 35735807F1154z5933Eb

PROBLEM: 1, 3, ['D', '921', 'n', '3195', '2219']

SOLUTION:
n129D