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, ['6969', 'P', '8161', '6347', 'P', 'S', 'z']
answer:
74361618P9696


question:
15, 16, ['1107', '1863', 'L', '6929', '9633', '9399', '4479', 'V', 'o', 'x', '1065', '7955', 'i', '7413', '6237', 'S', '1461', '8481', '7143', 's', 'U', 'd']
answer:
S7326


question:
2, 17, ['q', 'A', 'O', 'l', 'M', '1275', 'z', 'B', '4295', 'f', 'A', 'B', 'e', '8835', '7851', '1341', '3493', '2667', 'j']
answer:

3943143115875388eBAf5924Bz5721MlOA


