Task: Program Execution
Input (English): c, 2507, U, N, 9359, X, 1673, 6403, 4297, e, 1227, 7757, 3773, h, C, 9331, R, 8067, z, 8223, x
Output (English): 1, 3, 4, 6, 10, 14, 15, 17, 19, 21