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, 2, ['735', 'W', '5879', '8259']
answer:
W537


question:
5, 6, ['v', 'g', '5867', '9693', 'T', 'd', 'K', 'x']
answer:
dT


question:
6, 7, ['l', 'l', '3105', 'r', 'R', '2913', '8409', 'M', 'E']
answer:

90483192