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, ['5563', '647', '5203', '3645', '5075', 'x', 'W', 'D', 'R', 'e', 'r', '933', '1669', 'z', '3049', 'u']

5563647520336455075xWDRer933