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.

Ex Input:
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']

Ex Output:
K3172j14971048bIG937738371914215954


Ex Input:
4, 5, ['3001', '661', 'S', 'N', '7919']

Ex Output:
9197N


Ex Input:
10, 29, ['8059', '1777', 'G', 'I', '4623', 'W', 'C', '6509', 'A', '6809', 'q', '159', 'O', 'u', '9727', 'e', 'c', 'n', '5459', 'F', '4201', 'T', 'O', 'K', '2511', 'K', 'k', '3161', 'R']

Ex Output:

R1613kK1152KOT1024F9545nce7279uO951q9086