Task: Program Execution
Input (English): 1331, 1819, z, u, y, 1147, 1259, C, 7019, 9423, 8399, 8859, z, 3287, 8671, K, 53, 8201, 1749, 7963
Output (English): 1, 2, 6, 7, 9, 10, 11, 12, 14, 15, 17, 18, 19, 20