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: 19, 21, ['Y', 'z', '1873', 'b', '9077', '135', 'g', '8747', '6757', 'K', 'T', '4405', '3971', '4147', 'g', '8915', 'z', '8873', '3507', '2335', '7429', '3325', 'h', '3187', 'R', 'R']

742923353507