Task: Program Execution
Input (English): 6819, 4325, R, 6895, l, 5151, i, l, 549, N, 1479, X, o, n, e, I, Y, 1675, 2955, 7291, M
Output (English): 3, 5, 7, 8, 10, 12, 13, 14, 15, 16, 17, 21