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, 16, ['4089', 's', 'x', 'Q', 'z', 'g', 'R', '2777', '7255', 'W', '4997', 'e', '4465', 'a', '8807', '291', 'f', '7823', 'j']

2918807a4465e