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, 14, ['j', '2199', '6995', 't', 'U', 'C', '1589', '7061', '851', 'N', '7923', '7387', '2053', 'L', 'y', '3685', 'X', 'C', '4679', '3691', '2991', 'f']
answer:
L350278373297N15816079851


question:
8, 16, ['7751', 'Q', '9819', 'k', 'g', 'y', 'W', 'I', '6371', '9859', 'f', '7055', 's', 'I', 'W', '3029']
answer:
9203WIs5507f95891736I


question:
14, 20, ['4399', 'O', 'O', '6877', 'l', 'w', '7483', 'y', 'Q', '3331', '93', '4667', 'I', 'S', 'r', 'v', 'T', 'a', '4607', '3531', '1397', '7627', 'N', '5465', 'D', '4013', '2645']
answer:

13537064aTvrS