Task: Program Execution
Input (English): 5081 w r 7845 w g c 5769 5415 a 2935 3481 q u u k 4861 5369 p i 4983 7519 w z 5235 5941 w f 6523
Output (English): a, c, f, g, i, k, p, q, r, u, w, z