instruction:
In this task, you are given inputs i,j, and A, where i and j are integers and A is a list. You need to concatenate all elements of A from the ith element to the jth element, and print the resultant 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.
question:
1, 2, ['7161', '3547', 'u']
answer:
71613547


question:
1, 5, ['W', 'F', 'J', '7019', '4221', '9765', '3757', '6747', 'i', 'e', 'R', 'N', '6331', 'C', '3291', 'Z', 'a', 'f', 'Y', '5667', '1009']
answer:
WFJ70194221


question:
4, 7, ['e', '4517', '2717', '8125', '8127', 'c', 'Y', 'C']
answer:

81258127cY