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]: 5, 6, ['7319', 'U', 'Z', '1163', '8123', '4861', '117', '3893', '2489', 'S', '1511']
[EX A]: 16843218

[EX Q]: 1, 2, ['t', '1143', '4747', 'E', 'v', 'L', '451', '7367', 'O', 'T']
[EX A]: 3411t

[EX Q]: 6, 12, ['9763', '1031', '8747', 'Q', '3861', 'L', '8331', '7951', 'c', '117', '429', '6571', 'z']
[EX A]:
1756924711c15971338L