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.
12, 20, ['P', '8287', '3811', 's', '4687', 'R', '6741', 'u', '2545', '8171', '7257', 'g', 't', '6743', '7483', '9801', '9955', 'Y', '1897', 'z', 'f', 'A', '6029', 'j', '611', 'T', '5853']