Task: Program Execution
Input (English): 9417, 5689, 2067, x, 1877, s, n, m, 9941, k, k, z, o, f, 979, 6371, 849, 2365, y, 7095, 769, l, v, 1993
Output (English): f, k, l, m, n, o, s, v, x, y, z