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: 4, 20, ['a', 'K', '3873', 'l', 'g', 'f', 'h', '1119', 'Q', '8921', 'A', '47', '7717', 'U', '2581', 'X', '3955', '9367', '8341', '5177', '1673', 'k', '6765', 's', '8361', 'S', 'k']

5177834193673955X2581U771747A8921Q1119hfgl