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]: 3, 9, ['R', 'r', '7889', '4141', '1281', 'x', '9299', '4803', 'k', '2433']
[EX A]: k30849929x182114149887

[EX Q]: 14, 17, ['7891', 'n', '3475', 'c', '3281', 'Y', 'R', '5745', '4195', 'c', 'r', 'D', '7707', 'V', '7313', '8857', '1849', '5591', '553', '8389', '3833', 'm', 'v', '3663', 'k', 'U', 'o', 'p']
[EX A]: 948175883137V

[EX Q]: 11, 19, ['M', '9609', '291', 'y', 'D', 'm', '4343', 'V', '2629', '1441', '6587', 'k', '951', '7233', '2559', 'P', 'O', 'c', 'i', '5103', '8823', 'v', 'c', '4901', 'p', '7393', '1821', 'Q', '4699', 'U']
[EX A]:
icOP95523327159k7856