Given the task definition and input, reply with output. 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.

13, 23, ['f', 'T', 's', 'O', '1907', 'N', 'e', '619', 'j', 'l', 'b', '7111', '7933', 'C', 'h', 'E', 'S', 'm', '3937', 'p', '623', '3297', 'U', '3599']

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
U7923326p7393mSEhC3397