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:
2, 10, ['1183', '2299', 'O', '963', 'E', '9319', 'L', 'R', '1293', '8707', 'n', 'D', '6721', '2219', '3293', 'J', '4673', '325', '285', '5331']
answer:
70783921RL9139E369O9922


question:
6, 6, ['9431', '6731', 'A', '5153', 'K', '1567', 'D', 'Y', 'a', 'q', 'x']
answer:
7651


question:
1, 21, ['f', 'z', '9531', '7899', '9057', 'o', '387', '3191', '655', 'I', '4263', '9079', 'v', 'N', '8619', 'T', '9607', 'v', '4215', 'v', 'K', '6919', '8693', '1895']
answer:

Kv5124v7069T9168Nv97093624I5561913783o750999871359zf