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: 20, 21, ['G', '4023', 'S', 'v', 'g', '369', '4331', 'w', 'f', 'H', 'u', '723', 'g', '4915', '5719', '7251', 'S', 'D', '5355', '5543', '4027', '8341', 'l', '243', 's', 'f']

55434027