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.

3, 5, ['S', 'c', 'y', '6121', 'r', '3279', '6425']
r6121y

4, 5, ['5611', '2101', '3829', 'H', 's', '6545', 'X', 'T', 'q', 'p', 'O', 'C', 'U']
sH

7, 13, ['3757', 'm', '4871', '9223', 'a', '9855', '5731', '5323', 'p', '1001', 'b', 's', '3015']

3015sb1001p53235731