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: 7, 20, ['o', 'Q', '5355', '1377', '777', '7953', 'v', 'p', '951', 'R', '1747', '193', 'L', '4549', '7627', '7815', '3303', '5533', 'v', 'M', 't', '7399', 'J']

Mv55333303781576274549L1931747R951pv