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:
3, 4, ['19', '2669', 'v', 'd', '2221', '4219', 'A', 'P', '7499', 'z', 'm', 'l', '427', 'u']
answer:
dv


question:
1, 2, ['5111', 'U', '441', '8381']
answer:
U1115


question:
16, 16, ['2771', 'j', '535', 'M', '8329', 'G', 'Z', 'f', '8443', '11', 'E', 'X', 'O', 'y', '7321', '9307', 'q', '1967']
answer:

7039