Task: Program Execution
Input (English): d, 6793, 9087, p, 3083, 6115, 4407, a, 6777, 403, 1191, 6193, 7385, Q, S, 5763, l, y, 9307, 3081
Output (English): 2, 3, 5, 6, 7, 9, 10, 11, 12, 13, 16, 19, 20