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.

Q: 16, 18, ['7121', 'b', 'P', '7771', 'l', 'I', '7817', '5185', '7989', 'H', '4449', '3859', '869', '9321', 'O', '6453', '6219', '8349', '5327', 'm', 'c', 'O', '1185', '2703', '9673', 'q']

A: 943891263546
****
Q: 1, 12, ['2851', 'v', '8871', 'Z', '2227', 'm', 'z', 'B', 'v', '765', '1435', 'V', 'X', 'k', '5955', '2549']

A: V5341567vBzm7222Z1788v1582
****
Q: 12, 18, ['H', 'T', 'h', 'r', '5759', 'V', '9471', 'S', '261', '7167', 'q', '3465', '4329', '4809', '1775', '9359', '6811', 'U', '993', '4123', '7725', 'X', 'y', 'D', 'Q', 'v', '2913', 'o']

A:
U118695395771908492345643
****