Definition: 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.
Input: 3, 7, ['R', 'x', 'm', 'j', '6681', 'u', 'O', '1339', 'e', 'J', '7721', '6645', 'P', 's', '4903', 'H', '3217', '6863', 'y', '867', 'u', '3357']

mj6681uO