Task: Program Execution
Input (English): B, 4587, 8901, 9199, 6337, L, C, E, 7961, b, A, T, 9119, n, 8059, o, x, 3825, l, G, 639
Output (English): 2, 3, 4, 5, 9, 13, 15, 18, 21