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.

[Q]: 1, 2, ['3909', '5863', '707']
[A]: 36859093


[Q]: 3, 6, ['643', 'X', 'F', '7453', '8495', '7943']
[A]: 349759483547F


[Q]: 1, 5, ['J', 'L', '1223', 'k', 'H', '2787']
[A]:
Hk3221LJ