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: 8, 12, ['K', 'x', 'a', 'A', '6203', '117', '1007', '6063', '569', '9809', '9097', 'w', '3939', 'l', 'V']

SOLUTION: w790990899653606

PROBLEM: 10, 11, ['i', 'w', 'V', '2695', 'I', 'q', 'o', 'X', 'u', 's', 'e', 'f', '7693', 'q', '5845', 'e', '4161', '3059', 'F', '6863', '985', 'D', '3643', '383', 'A', '7515', '4335']

SOLUTION: es

PROBLEM: 2, 19, ['t', '1515', 'm', 'u', 't', '3489', 'q', '9871', 'D', 'W', '2201', '815', 'K', 'G', 'y', '5235', 'x', 'D', '7809', 'o', '8683', 'd', '3425', 'P', 'A', 'A']

SOLUTION:
9087Dx5325yGK5181022WD1789q9843tum5151