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: 2, 21, ['t', 'U', '9827', 'b', '4569', '5885', 'B', 'v', 't', 'R', 'm', 'u', '7033', '8061', '3091', 'f', 'P', 'h', '8955', 't', '705', 'E']

U9827b45695885BvtRmu703380613091fPh8955t705