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:
9, 11, ['m', 'r', '5241', 'x', 'Q', 'f', '1167', '1869', '4753', 'g', 'y', 'M', '7109', '2177', 'h', 'K', '5481', '9731', 'u', 'K', 'E', 't', '4867', '4539', '7943', 'W']
answer:
yg3574


question:
3, 9, ['R', 'r', '7889', '4141', '1281', 'x', '9299', '4803', 'k', '2433']
answer:
k30849929x182114149887


question:
3, 19, ['523', '7427', '3933', 'C', '2699', '7295', 'K', 't', '1063', '9249', 'R', 'p', '7717', '3681', 'C', 'L', 'B', '9685', '839', '565', 'P', 'b']
answer:

9385869BLC18637177pR94293601tK59279962C3393