Definition: 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.
Input: 18, 20, ['v', '7595', 'f', 'n', 'R', 'Q', '7139', '3001', '7071', '9315', 's', 'u', 'A', '7729', '7467', 'T', 'o', 'V', 'y', 'D', '2855']

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