Task: Program Execution
Input (English): L, p, 2423, b, X, 2721, 2621, A, 4773, b, t, e, h, G, 135, O, 9531, 6679, 6311, l, I
Output (English): 1, 2, 4, 5, 8, 10, 11, 12, 13, 14, 16, 20, 21