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, ['3421', '6129', '593', '203', '2731', '1393', '9739', '1087', '3453', '1389', 'W', 'D', 'b', '9261']

SOLUTION: 937939311372302

PROBLEM: 4, 7, ['1247', 's', 'J', 'w', 'X', '7211', 'c']

SOLUTION: c1127Xw

PROBLEM: 2, 13, ['g', 'q', 'w', 'K', 'J', '5141', '3963', '7951', 'z', '4503', 'R', 'I', '9601', 'z', '7785', '7583', 'U', '1575', '9067', 'L', '2305', 'A', 'T', 'p', '5931', '2585']

SOLUTION:
1069IR3054z159736931415JKwq