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 Q]: 4, 12, ['I', 'G', 'u', 'S', '9615', 't', 'p', 'P', 'R', 'v', '8819', '5379', 'I', '1165', '4545', '3117', '1577', 'y', 'W', 'R', 'O']
[EX A]: 97359188vRPpt5169S

[EX Q]: 2, 7, ['e', 's', '7009', 'z', 'I', '8649', '6405', '551', 'C', '5325', 'V', 'i', 'w', 'K', 'w', 'R']
[EX A]: 50469468Iz9007s

[EX Q]: 13, 18, ['1653', '4263', 'F', '3283', '669', '5355', 'p', 'y', '5303', '9607', '7593', 'e', 's', 'X', 'u', '1277', '5339', '5431', '4599', '8109']
[EX A]:
134593357721uXs