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: 18, 20, ['Q', '2423', 'c', 'U', 'o', '9369', 'c', '8805', 'q', '6445', '173', 'L', 'y', 'j', '1069', '3937', 'o', '1307', '8637', 'E', '3101', '385']

13078637E