Task: Program Execution
Input (English): O, C, S, 5779, 907, X, 6705, Y, 7485, 9419, F, 8827, R, 241, 9499, b, 4169, E, a, I
Output (English): 1, 2, 3, 6, 8, 11, 13, 16, 18, 19, 20