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:
3, 6, ['p', 'H', '2775', '2567', '7787', 'D', '3807', '4817', '5399']
answer:
D787776525772


question:
13, 17, ['k', 'f', 'C', '1551', 'Y', '2149', 'r', 'R', '5875', 'C', 'Y', '2145', 'O', 'b', 'M', 'y', '7407', 'X', '1227', 'F', 'n']
answer:
7047yMbO


question:
16, 16, ['9707', '9643', '7545', 'X', '4883', '1275', 'a', '1307', 'c', '3073', '6149', '5155', 'H', 'J', '4965', 'C', '355', 'S']
answer:

C