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.

Ex Input:
4, 4, ['339', '1345', '9749', '6877', 'b', 'K', 'f', '1443']

Ex Output:
7786


Ex Input:
1, 12, ['f', '8665', '6205', 'L', 'y', 'P', '9351', 'k', '1387', '657', 's', 'k']

Ex Output:
ks7567831k1539PyL50265668f


Ex Input:
4, 23, ['q', '3633', 'A', 'g', 'P', '6203', 'O', '8121', 'H', '9131', '4563', '6619', 'p', '8675', 'O', '6501', '937', 'D', 'Y', 'U', 'h', 'f', '1901', '5519', 'V']

Ex Output:

1091fhUYD7391056O5768p916636541319H1218O3026Pg