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, 18, ['497', '6595', 'W', 'w', '7683', '3433', '1861', '2603', 'H', '5451', 'f', '5405', 'a', '3311', '2691', 'M', '3119', 'K', '8969']

K3119M2691