In this task, you are given inputs i, j, and A, where i and j are integers and A is a list. You need to find all elements of A from the ith element to the jth element, reverse the order in which they occur, and then concatenate them to output the resultant 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 concatenate the elements and then reverse the string.

[EX Q]: 2, 4, ['v', '807', 'C', 'n', '7213', 'l', '5943']
[EX A]: nC807

[EX Q]: 5, 6, ['9891', '9721', 'q', 'u', '8721', 'l', 'm', 'p']
[EX A]: l8721

[EX Q]: 1, 7, ['G', '6593', 'D', '9689', 'T', '6999', 'w', 'G', 'l', 'o']
[EX A]:
w6999T9689D6593G