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: 2, 20, ['v', 'K', '6509', 'Q', '8187', 'N', 'g', '357', '2943', 'e', 'Z', 'W', 'w', '5945', '3201', 'R', 'V', 's', '3423', '3987', '3717']

K6509Q8187Ng3572943eZWw59453201RVs34233987