You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
In this task, you are given inputs i, j, and A, where i and j are integers and A is a list. You need to find all elements of A from the ith element to the jth element, reverse the order in which they occur, and then concatenate them to output the resultant 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 concatenate the elements and then reverse the string.

1, 3, ['238', 'h', '92', 'U', '2799']
Solution: 92h238
Why? Here, concatenating all the elements between the 1st element and 3rd element in reverse order gives '92h238'.

New input: 4, 13, ['e', 's', 'C', '5109', 'b', 'U', '5881', 'g', '935', 'h', '1851', 'f', '6537']
Solution:
6537f1851h935g5881Ub5109