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, 4, ['675', 'e', 'A', 'H', 'O', 'E', 'g', 'j', 'j', '5167', '2367', 'u', 'E', '753', 'M']

SOLUTION: H

PROBLEM: 3, 12, ['2159', 'f', 'u', '2675', '7357', '9325', '1275', '8897', 'I', '2095', '5835', '577', 'g', '2783', '7843', '8517', '4185', '5847', '2645', '2357', 'l', 'v', '2239', '141', 'o', '2529', '7977', '8445', '2363']

SOLUTION: 77553855902I79885721523975375762u

PROBLEM: 7, 7, ['l', '3863', '9673', 's', 'j', '6039', '6891', 'r', '3373', '401', '3659', 'r', 'T', '207', 'W', '289', 'p', 'U', 'w', '3757', '9865', 'X', 'M', '9289', 'p', '6491', '6403', 'I', 'k']

SOLUTION:
1986