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:
7, 9, ['4311', 'Q', 'j', '3613', '9671', 'u', 'y', '3321', '2069', '4299', 'W', 'c', '627', '1327', '9747', 'Q', 'k', '9587', '5911']
answer:
96021233y


question:
3, 15, ['5807', 'M', 'A', 'm', '4557', 'P', 'y', '2895', 'K', 'K', '5379', '2367', 'M', '8653', '3847', 'D', '7725', '6571', 'L', '2011', 'h']
answer:
74833568M76329735KK5982yP7554mA


question:
1, 20, ['k', '6329', '4273', 'C', 'i', 'J', '3175', '5517', 'L', 'v', 't', '4993', '6207', 'r', '4751', '1791', 'c', '4883', 'K', 'u', 'q', 'F', 'j']
answer:

uK3884c19711574r70263994tvL71555713JiC37249236k