instruction:
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.
question:
4, 12, ['S', '1783', 'd', '3489', '2291', '4757', 'b', '5761', 'Y', 'M', '6453', '2477', 'B', 'm', '6749', 'S', '3291', 'L', '8725', '8637', 'l', '1747']
answer:
77423546MY1675b757419229843


question:
1, 5, ['7115', '3109', '3805', '6831', '6897', 'y', 'b']
answer:
79861386508390135117


question:
11, 13, ['h', 's', 'Q', '9071', 'x', 'G', 'G', '1815', '51', 'N', '3541', '1393', '939', '6351', 'w', 'v', '8171']
answer:

93939311453