Task: Program Execution
Input (English): 5969, 7721, k, z, 4793, 9879, d, c, e, 6245, 8201, b, c, u, 7987, w, j, 8861, 2779, v, 7721, 5481, x, 6217
Output (English): b, c, d, e, j, k, u, v, w, x, z