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: 10, 20, ['H', 'p', 'u', '621', '7763', '9431', 'F', 'T', 'W', 'Q', '963', '5595', 'a', '3001', 'Q', 'M', 'u', 'E', 'F', '6121', 'N', '1083', 'Q', '1387', '1831', 'T', '9059']

Q9635595a3001QMuEF6121