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, 23, ['7529', '8921', 'Q', 'l', '8935', 'T', '1227', '4487', '9337', 't', 'f', '4859', 'P', 'X', '4637', '2369', '6679', 'I', '4361', 'Y', 'v', '7801', 'a', '2629', 'J']

a7801vY4361I667923694637