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: 5, 20, ['l', 'w', '9491', '957', 'G', 'p', 'Z', '5783', 'v', 'f', '4759', 'n', 'v', '209', 'Z', 'R', 'S', 'g', '7645', 't', '9945', '8115']

t7645gSRZ209vn4759fv5783ZpG