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: 3, 20, ['G', 'w', 'm', 'C', '6227', '9055', '1849', 'l', 'x', 'n', '5015', 'U', 'h', '6859', '4351', 'J', 'D', 't', 'W', 'w', '4463', 'n']

wWtDJ43516859hU5015nxl184990556227Cm