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.

3, 7, ['P', 'P', 'H', 'r', '3563', 'n', 'M', '1577', '6453']
Mn3653rH

9, 21, ['D', 'j', 'T', '91', 'W', '9709', 'H', '1023', '4595', '1241', '917', '383', '7739', 'G', 'I', 'b', '8401', '7941', 'j', '2713', 'K', '2443', 'E', 'B', '1515', '5141', '1221', '993']
K3172j14971048bIG937738371914215954

2, 9, ['d', '4973', '6775', 'R', '2005', 'Z', '7803', '9041', 's', 'V', 'x', '9627', '3829', 'S', 'd', 'e', '6889', '2305', 'c', '3543']

s14093087Z5002R57763794