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.

Input: Consider Input: 2, 17, ['781', '1949', '8017', 'I', 'F', 'k', 's', 'f', '9531', '3769', '8135', 'R', '7643', 'v', '6217', '4085', 'M', '1993']

Output: M58047126v3467R531896731359fskFI71089491


Input: Consider Input: 2, 9, ['3441', 'a', 'o', 'B', 'e', 'u', 'B', 'Z', '1287', '323', '5849', 'F', '7917', '1023', '6323', 'A', 'v', '491', '6123', '5949', '1409', 'I', '6889']

Output: 7821ZBueBoa


Input: Consider Input: 7, 21, ['R', '757', '2681', '4557', 'y', 'A', '4079', 'r', 'g', '9625', 'B', '2175', '8425', 'i', '3269', '375', '4283', '7587', '1043', 'f', '4871']


Output: 1784f3401785738245739623i52485712B5269gr9704