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, 9, ['6157', 'Z', 'f', 'N', 'Z', 'T', '7299', 'G', 'w', '3923', 'H', '3255']

SOLUTION: wG9927T

PROBLEM: 15, 16, ['4531', 'a', 'I', 'W', '1071', '1301', 'v', 's', '3521', '7203', '1157', 'w', '7201', 'a', 'I', 'z', 'V', 'X', 'j']

SOLUTION: zI

PROBLEM: 6, 27, ['7595', '3653', '2333', '9803', 'q', '8997', '4811', '4227', '4641', 'u', 'j', 'X', 'M', '3909', '3661', 'A', 'x', '8747', '8157', 'v', '9183', 'Z', 'l', '821', '4043', '1259', 's']

SOLUTION:
s95213404128lZ3819v75187478xA16639093MXju1464722411847998