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, 9, ['7671', '575', 'l', '989', '7015', 'X', 'x', '3543', '3771', '905', '3815', 's']
answer:
17733453xX5107989l


question:
2, 5, ['l', 'E', '729', 'U', 'z', '9729', '3247']
answer:
zU927E


question:
2, 9, ['47', '9357', '6839', 'D', 'h', 'e', '877', 'U', '3279']
answer:

9723U778ehD93867539