Task: Program Execution
Input (English): Y, 8213, v, i, 5737, W, H, F, V, H, 8773, Y, 4419, 2583, O, g, T, I, 1227, 4805, D
Output (English): 1, 3, 4, 6, 7, 8, 9, 10, 12, 15, 16, 17, 18, 21