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: 12, 20, ['H', '477', 'K', '433', '6543', 'W', 'J', 'I', 'T', 'U', '3061', 'm', '9079', 'R', '3217', '9723', 'H', '5701', '2947', 'Q', 'U', 'p', 'V', '4977', '6345', '3297']

Q29475701H97233217R9079m