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: 8, 18, ['B', 'e', '2281', '7757', '2921', '6313', 'S', 'T', 'U', '5587', 'o', '3647', 'U', 'm', '7417', '2519', 'f', 'r', 'M', '1483', 'c']

TU5587o3647Um74172519fr