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: 16, 18, ['4545', 'M', 'S', '9631', 'v', '3517', 'Y', 'G', '3037', 'x', '1791', '1159', 'o', 'y', '5679', '7811', 'o', '1247']

1247o7811