Task: Program Execution
Input (English): D, 4821, X, 8519, P, 7225, 3437, 9387, g, 6353, 8319, 5625, 7591, Y, S, y, 9511, 2155, e, V
Output (English): 2, 4, 6, 7, 8, 10, 11, 12, 13, 17, 18