Task: Program Execution
Input (English): z, h, x, 2777, q, 7825, f, 3823, X, z, l, 2267, K, 5595, 1795, V, 7273, 2525, 5733, 393, 8831, v, U
Output (English): 4, 6, 8, 12, 14, 15, 17, 18, 19, 20, 21