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:
12, 12, ['c', 'a', 'G', 't', '753', 'x', 'I', '4479', 'i', 'y', 'J', 'w']
answer:
w


question:
2, 10, ['V', '7549', '4639', '3825', '4619', 'w', '7667', '557', 'L', 'z', '1883', 'k', 'j', 'o', 'p', '3945', 'u', 'l', '5637']
answer:
zL7557667w9164528393649457


question:
2, 21, ['757', 'I', '3453', '793', '8153', '2601', '4013', 'W', '2601', 'f', 'T', '4129', '8415', 'c', '6425', '6859', 'Z', 'g', '5457', '7573', 'x', 'd', '3639', '5601', '4401', '1259', '1073', '1037']
answer:

x37577545gZ95865246c51489214Tf1062W3104106235183973543I