Task: Program Execution
Input (English): 2369, 5835, 4515, 1663, u, 5879, 9133, 1019, c, z, 7997, L, l, g, 6029, 3341, q, 1667, 3853, R, 7785, h, S
Output (English): 1, 2, 3, 4, 6, 7, 8, 11, 15, 16, 18, 19, 21