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, 3, ['r', '5153', 'I']
[EX A]: I3515r

[EX Q]: 10, 19, ['6733', 'q', '2197', 'h', '9975', '3059', 'e', '8475', '281', 'L', '9119', 'B', '8857', 'U', 'R', 'h', 'e', 'J', 'P', 'l']
[EX A]: PJehRU7588B9119L

[EX Q]: 1, 10, ['6897', '89', 'P', 'b', '6791', 'C', '521', '4523', 'f', 'L', 'p', 'l']
[EX A]:
Lf3254125C1976bP987986