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: 1, 12, ['6817', '5475', 'O', '4767', '2131', '5113', 'Q', '4887', 'U', '5707', '7213', '4459', '2507']

68175475O476721315113Q4887U570772134459