In this task, you are given inputs 'i', 'j', and A, where 'i' and 'j' are integers and A is a list. A list is shown by two brackets and comma-separated numbers and characters inside, like ['1', '12', 'l']. You need to concatenate all elements of A from the ith element to the jth element, and then reverse the resulting 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 reverse first and then concatenate.

1, 7, ['P', 'h', '1443', 'b', 'K', '2641', '3831']
13831462Kb3441hP

1, 4, ['63', '5429', '5563', '2045', '875', '7163', '1869']
54023655924536

8, 11, ['4171', '7017', '3053', '6649', 's', 'N', '9323', '5115', '6469', '3723', '5089', '1385', 'h', '6887']

9805327396465115