Task: Program Execution
Input (English): 1931 7423 4185 1463 L g 1555 p 7987 6381 8047 6981 8231 R J 4739 7731 O 5761 2397 O 7799 5479 u 3283
Output (English): 1, 2, 3, 4, 7, 9, 10, 11, 12, 13, 16, 17, 19, 20, 22, 23, 25