Task: Program Execution
Input (English): U, 1531, 2423, 1979, 209, 9221, 375, 1087, 8769, 8401, 1609, K, 3691, 7775, f
Output (English): 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14