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: 4, 18, ['8157', 'o', 'F', 'n', '4525', '5299', 'k', 'E', '917', 'H', '5039', 'b', '7389', 'k', 'D', 'a', 'j', 'X']

n45255299kE917H5039b7389kDajX