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: 4, 20, ['6855', 'g', 'k', 'b', 'C', 'R', '1817', 'Q', 'F', '3813', 'M', 'S', 'd', 'i', 'A', '1123', '9071', '9283', 'k', 'U']

bCR1817QF3813MSdiA112390719283kU