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.
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Question: 15, 18, ['2157', 'P', 'n', '5155', 'L', 'P', 's', '5401', 'c', 'T', 'h', '3801', 'S', 'c', 'V', 'P', 'l', 'G', 'j', '839', '6383', 'C']

Answer: GlPV


Question: 1, 2, ['2081', '5651']

Answer: 56512081


Question: 19, 20, ['t', '4917', 'u', '3689', '9807', '8181', 'v', 'D', '6421', '3753', '3475', '133', 'N', 'Y', '4943', '6451', '8471', '6667', 'Y', '199', 'Z', 'j']

Answer:
199Y