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:
5, 7, ['N', 'U', 'L', '1205', '7327', 'b', 'c']
answer:
cb7237


question:
1, 3, ['6017', 'o', '1817', 'W']
answer:
7181o7106


question:
1, 2, ['2625', 'g', 'z']
answer:

g5262