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: 15, 18, ['3107', 'm', 'b', 'm', 'O', '215', 'b', '1749', '7373', 'x', '5713', 'U', '2443', '5521', '6679', '2373', 'u', '8531', 'c', 'h', 'd', 'm', 'I', 'f', 'C', 'E', '4247']

66792373u8531