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, 11, ['4381', '7607', '3995', '7639', 'W', '2377', '2639', 'Z', 'D', '4511', 'K', '3211', '6939', 'n', 'J', 'd', '9647']
[EX A]: K1154DZ93627732W

[EX Q]: 4, 7, ['C', 'j', 'F', '495', 'H', '6595', 'h', '7567', 'f']
[EX A]: h5956H594

[EX Q]: 5, 5, ['2131', 's', 'q', '1243', 'a']
[EX A]:
a