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: 1, 4, ['63', '5429', '5563', '2045', '875', '7163', '1869']

SOLUTION: 54023655924536

PROBLEM: 1, 2, ['735', 'W', '5879', '8259']

SOLUTION: W537

PROBLEM: 2, 5, ['8903', '8149', 'x', 't', 't', '6255', '4457', 'Y', '7415', '2779', '771', 'y', 'l', 'C', 'v', 'p', '5403', 'P', '969', 'f', '5741']

SOLUTION:
ttx9418