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, 6, ['9431', '6731', 'A', '5153', 'K', '1567', 'D', 'Y', 'a', 'q', 'x']

SOLUTION: 7651

PROBLEM: 9, 16, ['E', 'M', '361', '4657', '8215', '8495', '73', 'O', '1949', '8617', '7963', 'B', '4393', 'b', '5085', '1535', 'A', 't', '4831', 'v', '9665', 'Z', '7017', '4449', 'Z', 'd', 'Q', '3879', 'J', 'y']

SOLUTION: 53515805b3934B369771689491

PROBLEM: 7, 15, ['O', 'R', '2607', '2401', 'z', '1735', '5225', '2117', 'N', 'n', '6121', 'c', 'y', 'O', 'A', '9287', '6215', '3179', 'l']

SOLUTION:
AOyc1216nN71125225