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: 5, 20, ['j', 'Q', 'm', '6493', '5903', 'f', '5499', 'K', 'O', '335', '3517', 'x', 'r', 'J', '8699', '3125', 'H', '3985', 'E', '6641', 'l', 'c']

5903f5499KO3353517xrJ86993125H3985E6641