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, 9, ['g', '309', 'x', '3537', '5995', 'K', '6951', 'x', 'b', '3171', '9079', '7597']
[EX A]: bx1596K59957353x903

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

[EX Q]: 4, 9, ['661', 'Q', '9985', '6371', 'S', '2481', '3343', '8623', '6107']
[EX A]:
7016326834331842S1736