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.
15, 19, ['b', '9265', '5121', '1651', 'L', 'H', '8667', '7263', '2321', '3799', 'R', 'P', 'u', '8287', '5341', '8889', '7143', '229', 's', '1779', '2929', '2739', '6123', 'k', 'J', 'k', '2893', '4735']