Task: Program Execution
Input (English): 4353, 867, 2361, 4221, w, 2385, z, 1619, 377, S, i, 4801, 7815, R, 3325, 1881, x, L, 1769, 4863, 5301
Output (English): 1, 2, 3, 4, 6, 8, 9, 12, 13, 15, 16, 19, 20, 21