Task: Program Execution
Input (English): z, 373, 5075, X, 2259, 2331, u, 1469, 2005, V, s, r, D, O, 3781, 1193, 7221, i, 8937, t, 7025, y
Output (English): 2, 3, 5, 6, 8, 9, 15, 16, 17, 19, 21