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, 9, ['C', 'V', '9945', 'W', 'R', 't', '471', 'Y', 'F', '2445', 'd', 'R', 'l', 'f', '5041', 'm', '7347', 'j', '6257']
answer:
FY174tRW5499VC


question:
1, 4, ['B', '5591', '1237', '1519']
answer:
915173211955B


question:
2, 8, ['993', 'H', 'P', '1253', '9321', '4149', 'o', '9131', '5533', '4303', 'P', '219', 'u', 'p', '8111']
answer:

1319o941412393521PH