Given the task definition and input, reply with output. 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.

7, 23, ['P', '7555', 'B', '3977', 'r', 'H', '9613', 'T', 'a', '3499', '7679', 'l', 'O', '4741', '5201', '7837', '157', '1569', '9675', '4103', 'M', '3201', 'K', '123', '9', '7791', '7383', 'x', 'T', '7985']

K1023M301457699651751738710251474Ol97679943aT3169