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: 12, 21, ['1761', 'O', '1371', 'p', 'q', 'f', 'n', 'W', 'X', 'w', 'X', 'u', 'p', 'D', 'c', '7293', '985', 'C', 'r', '1433', 'o', 'v']

o1433rC9857293cDpu