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: 4, 18, ['3885', '3309', '8097', '6375', '9939', 'U', 'r', 'C', 'Y', '989', '217', '5091', 'c', 'F', 'm', '6779', '623', '5873', 'f', '909', 'c']

58736236779mFc5091217989YCrU99396375