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, 16, ['7861', '6401', 'D', 'a', 'Q', 'e', '177', 'b', 'n', '7735', '4821', 'c', 'L', 'X', '4249', 'n', 'o', '9889', '169', 'R']

77354821cLX4249n