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: 2, 21, ['9883', 'c', '2027', '8207', 'X', '2521', '2437', 'F', 'U', 'h', '4777', 'j', '9993', 'X', 'q', '327', '4123', 'w', '913', 'u', '7019']

7019u913w4123327qX9993j4777hUF24372521X82072027c