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, ['7679', 'r', '6957', '9777', '5287', '6035', '3883', 'E', 'i', '2917', '8899', '9627', '7309', 'Y', '3811', 'R', 'y', 'P', '3195', 'I', '939', '8609', 'r', '5361']