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: 1, 19, ['6129', '8647', '1605', 'H', '2147', '2361', 'r', '4081', 'j', '2749', '7397', 'J', '1251', 'F', 'P', '6739', 'F', '7953', 'G', '795', '8417', 'X', 'U', '5121']

G7953F6739PF1251J73972749j4081r23612147H160586476129