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: 3, 21, ['4681', 'I', '7639', 'N', 't', 'K', 'W', 'H', 'B', 'g', '7659', 'A', '1901', '8781', '2333', 'M', 'i', '1029', 'W', 'G', '3783', 'J', 'N', 'o', 'l', 'J', 'Y', 'n', '1463']

3783GW1029iM233387811901A7659gBHWKtN7639