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, 5, ['C', '4345', 'T', 't', 'U', 'p']
answer:
UtT


question:
2, 2, ['w', '5569', '6229', 'b']
answer:
9655


question:
1, 1, ['I', '4315']
answer:

I