In this task, you are given inputs 'i', 'j', and A, where 'i' and 'j' are integers and A is a list. A list is shown by two brackets and comma-separated numbers and characters inside, like ['1', '12', 'l']. You need to concatenate all elements of A from the ith element to the jth element, and then reverse the resulting 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 reverse first and then concatenate.
12, 21, ['b', 'e', '8535', '2543', '2693', 'm', '3991', '3271', 'V', 'U', 'l', 'Y', 'd', '5191', 'e', '5063', 'Z', '6253', '647', 'n', 'V', 'I', '5053', '7301', 'k', '6805']