Task: Program Execution
Input (English): 1669, 1917, 5209, 3573, s, 7397, t, e, s, s, e, Z, y, u, e, s, e, 3047, 4009, 3237, h
Output (English): 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 21