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: 2, 6, ['Q', '4571', 'S', 's', '5669', '7689', '3335', 'C', 'J', '6565', '3031', 'G', '9817', 'O', '9691', '9069', 'u', '5965', 'R']

SOLUTION: 98679665sS1754

PROBLEM: 1, 2, ['5111', 'U', '441', '8381']

SOLUTION: U1115

PROBLEM: 7, 8, ['3539', 'D', 'p', '273', '957', '6797', 'l', 'v', 'f', '7613', 'S', 'u', 'I', '3335']

SOLUTION:
vl