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


question:
3, 4, ['2419', '643', '8177', '7291', '561', '6529', '4101', 'u', '6445']
answer:
19277718


question:
13, 15, ['t', '5409', '1099', '4245', '6391', 'Z', '377', 'm', 's', 'm', '3987', 'd', 'g', 'C', '3825', 'E']
answer:

5283Cg