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: 7, 17, ['6247', '6655', 'g', 'm', '8745', 'W', 'U', 'L', 'i', '2621', 'f', 't', 'I', 'r', '2141', '7611', 'W', 'o']

ULi2621ftIr21417611W