Definition: 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.
Input: 9, 21, ['z', 't', 'Y', 'i', '8999', '2553', 'F', 'k', 'k', 'i', 'z', 'i', 'M', '387', '8163', '8419', '5269', 'm', 'w', '7539', '7419']

74197539wm526984198163387Mizik