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: 1, 12, ['X', 'F', '647', '8761', 'u', 'g', 'D', '3973', 'x', 'j', 'N', 'x', '839', '7405', '8271', '2975', 'g', 'W', '6157']

XF6478761ugD3973xjNx