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: 10, 21, ['285', '7243', 'q', '4191', 'A', 'E', 'v', 'm', 'U', 'D', 'E', 'T', '3147', '4701', '3057', '8679', '6521', '7887', '8325', '8279', 'T', 'Q', '7971']

T82798325788765218679305747013147TED