Task: Program Execution
Input (English): 3173 p 7977 6953 x Y u 6895 3769 b 9493 c 8865 p 7073 3285 o 1027 T 6171 9223 135 Y z H 4513
Output (English): 1, 3, 4, 8, 9, 11, 13, 15, 16, 18, 20, 21, 22, 26