Task: Program Execution
Input (English): I, d, l, 2073, 9007, 8485, 163, 7619, s, 4773, x, z, k, 8791, c, 7337, O, 8061, t, u, 9725, 5271
Output (English): 1, 2, 3, 9, 11, 12, 13, 15, 17, 19, 20