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.

Let me give you an example: 1, 3, ['238', 'h', '92', 'U', '2799']
The answer to this example can be: 92h238
Here is why: Here, concatenating all the elements between the 1st element and 3rd element in reverse order gives '92h238'.

OK. solve this:
1, 3, ['C', '1931', 'S']
Answer:
S1931C