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: 13, 16, ['a', 'y', 'd', 'F', 'P', '8965', 'G', 'V', 'W', 'y', '4275', '7653', '5643', '321', 'u', '721', 'm', '1483', '3321', '3851', '6373', '9445', '1193']

SOLUTION: 127u1233465

PROBLEM: 1, 2, ['L', '7723']

SOLUTION: 3277L

PROBLEM: 1, 17, ['7975', 'Y', 'b', '9395', 'M', 'l', 'G', 'C', '9273', 'z', 'j', '3859', '9285', '1123', '8495', 'A', '221', '1953', 'p', 'l', 'O', 'k', 'U', '8509', '5945']

SOLUTION:
122A5948321158299583jz3729CGlM5939bY5797