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, 20, ['B', '8675', '8857', '7149', '205', '8773', '1897', 'w', 'Q', 'I', 'X', 'G', 'V', '7909', 'o', '8599', '7157', '4479', 'R', '4349', '9511']

4349R447971578599o7909VG