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: 1, 2, ['6627', 'J']

A: J7266
****
Q: 18, 18, ['O', '7845', 'f', '2313', 'f', '9661', 's', 'O', '6009', '6997', 'f', 'T', 'f', '6517', 'E', 'H', 'k', 'Y', 'i', '2839', '1839', '3251', 'H', '1939']

A: Y
****
Q: 19, 19, ['2083', 'b', '2325', '3001', '4049', '9123', '9519', 'l', 'M', 'f', 'T', 'k', '6459', '161', 'y', '6749', 'J', '3393', '1181', 'Z', 'N', 'e', '9375', '3169', '5515', 'z', '211', 'M', '8381']

A:
1811
****