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: 5, 5, ['6131', '6209', 'H', 'g', '4529', '491', '2143', '6281']

SOLUTION: 9254

PROBLEM: 2, 5, ['n', '8897', '6611', '2857', 'p']

SOLUTION: p758211667988

PROBLEM: 1, 5, ['u', 'f', '7015', 'A', '51', '3475']

SOLUTION:
15A5107fu