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


question:
3, 13, ['9827', '3335', 'K', 'p', '7941', 'U', '4513', 'l', 'B', '179', '9825', '5437', 'u', '7853', '8907', 't', 'V', 'U', 'K', '7159', '6077', 'n']
answer:
u73455289971Bl3154U1497pK


question:
13, 16, ['V', '9275', 'X', '1495', 'o', 'r', 'l', 'V', 'Q', '71', 'P', '3425', '3041', 'i', 'd', 'u', '8149', 'U', 'B', 'I', '9999', '6519', '8603', 'a', 'f', 'F', '1685', '2877', '7559']
answer:

udi1403