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]: 2, 3, ['5191', '9077', 'a']
[EX A]: a7709

[EX Q]: 15, 16, ['4531', 'a', 'I', 'W', '1071', '1301', 'v', 's', '3521', '7203', '1157', 'w', '7201', 'a', 'I', 'z', 'V', 'X', 'j']
[EX A]: zI

[EX Q]: 4, 5, ['f', '7275', 'R', '5315', 'c', 'S', 'p', '2831', 'j', 'D', 'V', '3327', '6083', '9203', 'U', 'W', 'n', 'X', '9333', '9743', 'S', 'g', 'F', 'T', '2311', 'q']
[EX A]:
c5135