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, 19, ['p', 'k', '2775', 'c', 'j', 'v', '441', 'w', '687', 's', '7415', 'F', 'S', '4211', '5465', 'p', 'U', 'v', '4721', 'q', 'R', 'O']

s7415FS42115465pUv4721