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: 17, 23, ['9719', 't', 'Z', 'O', '1087', 'g', '8327', '9439', '2111', '5013', 'c', 'U', '817', 'n', 'C', '639', '3509', '589', '8647', '6935', 'K', '6789', 'Q', 'Y', 'u', 'C', '3939', '5667', 'j', 's']

Q6789K693586475893509