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, 10, ['s', '3299', 'K', 'D', '4621', '9075', 'K', '6987', 'S', '9829', 'm', 'I', '3797']
answer:
9289S7896K57091264DK


question:
2, 5, ['Y', 'O', 'Q', 'l', 'E']
answer:
ElQO


question:
13, 15, ['1229', '3087', 'T', '2107', '8499', '7025', 'i', 'x', 'j', '4231', '7423', 'Q', '7631', '5631', 'H']
answer:

H13651367