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, 5, ['z', 'w', 't', '3663', '9611', '3737', '4277']
answer:
11693663t


question:
3, 4, ['435', 'K', '8051', '7159']
answer:
95171508


question:
2, 8, ['6217', '5727', '6595', 'u', '1997', 'v', '8159', '3577']
answer:

77539518v7991u59567275