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: 11, 19, ['K', '6025', '9437', '4557', '641', '5503', '7303', 'b', 'f', 'W', '5297', '5775', 'G', '205', '9311', 'X', '4191', '7601', 'R']

R76014191X9311205G57755297