Task: Program Execution
Input (English): 6067, 9641, w, 8923, z, 5053, 711, 2123, h, 9401, 9487, 1795, 5499, N, t, 3811, 2673, 8973, F, U, 4047
Output (English): 1, 2, 4, 6, 7, 8, 10, 11, 12, 13, 16, 17, 18, 21