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.

[EX Q]: 1, 3, ['u', 'D', '6391']
[EX A]: 6391Du

[EX Q]: 1, 10, ['2231', 'X', 'P', 'f', '3685', 'm', '9157', '6307', '8867', '9941', '9879', '3535', 'W']
[EX A]: 9941886763079157m3685fPX2231

[EX Q]: 6, 8, ['y', 'g', 'I', '7137', '1589', '6209', '9823', '4543', '8683', 'L', 'H', '1937', 'R', 'c', 'E', 'l', '4221', '7981']
[EX A]:
454398236209