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: 5, 6, ['C', '2155', '4217', 'L', 'S', '3981', '7395', 't', '8391', 'U', '6173', '4343', '523', 'f', 'I', '2943', 'o', '8487', 'K', '5155']

S3981