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: 11, 20, ['a', 'N', 'j', '5369', 't', '5911', 'a', '2655', 'e', '3611', 'I', 'T', '6787', '3573', '4699', 's', 'd', '7701', 'P', 'f', '9505', '2031']

fP7701ds469935736787TI