Task: Program Execution
Input (English): 1821, Z, D, 1801, 9525, Z, 4335, 3847, 2113, 9561, 3599, v, 7387, 8199, Y, s, 6961, t, C
Output (English): 1, 4, 5, 7, 8, 9, 10, 11, 13, 14, 17