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: 12, 20, ['v', 'O', 'K', 'p', '9857', '9099', 'X', 'T', '3569', '969', '3039', '8753', '4237', '8965', '9591', '4197', '5855', 'X', 'd', '7291', 'u', '8871']

875342378965959141975855Xd7291