instruction:
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.
question:
1, 4, ['63', '5429', '5563', '2045', '875', '7163', '1869']
answer:
54023655924536


question:
2, 8, ['9691', 'u', 'o', '4027', 'q', '7799', 'v', '6433', '6817', 'u', 'w', 'Z']
answer:
3346v9977q7204ou


question:
10, 23, ['9003', 'A', 'H', '8145', '5325', '5067', 'm', '3883', '9151', '9143', '9043', '2661', 'm', '6821', '4223', 'r', 'Q', '7925', 'b', '487', '407', 'R', '443', 'W', '2713', 'Q', 'G', 'I', '6987', 'm']
answer:

344R704784b5297Qr32241286m166234093419