Task: Program Execution
Input (English): I, 5387, 9773, D, 8251, m, 8681, 3809, 3759, t, 4085, 2747, W, s, 4877, 2307, Y, 5883, 7031, 951
Output (English): 2, 3, 5, 7, 8, 9, 11, 12, 15, 16, 18, 19, 20