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:
2, 12, ['p', 'o', '2673', 'd', 'r', 'n', 'Z', 'u', 'm', '5195', '6521', '7671']
answer:
176712565915muZnrd3762o


question:
3, 3, ['x', 'v', 'p', '4337', '635', '8927', 'B']
answer:
p


question:
3, 11, ['9113', 'x', '9467', '7185', '5897', '5023', '4115', '1689', '9227', '3531', '5999', '717']
answer:

999513537229986151143205798558177649