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.

Example Input: 3, 20, ['x', 'S', 's', 'a', '5077', 'D', '3979', 'I', '3129', 'R', '8517', 'r', 'l', 'K', 'N', '9701', '227', 'n', '9385', 'U']
Example Output: U5839n7221079NKlr7158R9213I9793D7705as

Example Input: 6, 8, ['u', 'y', '5599', 'i', 'Z', 'F', '8907', 'A', 'l', '8821', 'B', 'G', 'd']
Example Output: A7098F

Example Input: 9, 22, ['O', '213', '4729', '3107', '4163', 'Q', '9447', '7583', '1705', '7301', '8159', 'P', 'B', 'W', '8341', 'J', 'p', '5155', 'R', 'E', 'p', 'q']
Example Output:
qpER5515pJ1438WBP951810375071