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: 15, 22, ['B', 'i', '6819', 'I', '807', '3639', '2649', 'a', 'B', 'R', '5119', '1269', 'G', 'v', '7679', 'S', '8217', 'S', 'T', '3769', 'n', 'N']

Nn3769TS8217S7679