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 Input:
8, 21, ['2943', 'u', '4551', 'A', '2429', 'o', 'L', '1565', 'a', 'X', '7355', 'R', 'T', '6539', '9603', '967', 'l', '1715', '3931', '5387', '7197', '435']

Ex Output:
7197538739311715l96796036539TR7355Xa1565


Ex Input:
8, 9, ['W', '1701', 'c', '3565', 'W', '687', 'b', 'o', 's', '3041', '4325', 'A', '2405', '5087', 'y', 'x', '2017', 'Y', 'U']

Ex Output:
so


Ex Input:
6, 20, ['W', '6757', '409', 'A', '763', '2875', '6447', '6617', '8919', '8987', '2301', '7977', '781', '9509', 'v', '8299', 'z', '7865', '9583', '4857']

Ex Output:

485795837865z8299v95097817977230189878919661764472875