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, 21, ['883', 's', '9727', '923', 'I', '9497', 'P', 'U', 'T', '4969', '6833', '8219', '9047', 'y', '8141', '7781', 'G', 'E', 'J', '2631', '5729', 'q', 'Y', '6727', '3535', '2577', 'M', 'k', '9775']

57292631JEG77818141y9047821968334969TUP