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:
5, 7, ['Y', '5101', 'B', '5129', 'a', 'y', 'v', '4577', '5455', '6685', '6435']
answer:
vya


question:
18, 22, ['I', '4687', 'V', 'y', 'U', '2255', '6971', '793', 'W', 'O', '3233', '5061', '6355', 'X', 'U', '8435', 'e', 'z', 'u', '6055', 'd', '1493', 'e', '4453', 'X']
answer:
3941d5506uz


question:
11, 21, ['L', 'F', '8931', '2543', '8063', 's', 'L', 'M', 'K', '7329', '7129', 'V', '535', '4661', 'y', 'O', '8955', 'K', '3697', 'k', 'k', '67', '3097', 'i', '3223']
answer:

kk7963K5598Oy1664535V9217