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]: 1, 5, ['E', 'h', 'N', '9931', 'F', '9367', 'N', 'K', 'Y', '1449', '8503', '9277', 'k', '9627', 'Q', 'v']
[EX A]: F1399NhE

[EX Q]: 5, 6, ['v', 'g', '5867', '9693', 'T', 'd', 'K', 'x']
[EX A]: dT

[EX Q]: 15, 18, ['k', '9913', '7151', 'c', '8207', '147', '3579', '551', '2865', 'Z', 'J', '2095', '1763', '2511', 'P', '9953', '9723', '7941', '9453']
[EX A]:
149732793599P