val isCusip = fn(s string) {
    if len(s) != 9 : return false

    val basechars = '0'..'9' ~ 'A'..'Z' ~ "*@#"

    val sum = for[=0] i of 8 {
        var v = index(basechars, by=s2s(s, of=i))
        if not v: return false
        v = v[1]-1
        if i div 2: v *= 2
        _for += v \ 10 + v rem 10
    }

    s[9]-'0' == (10-(sum rem 10)) rem 10
}

val candidates = fw/037833100 17275R102 38259P508 594918104 68389X106 68389X105/

for c in candidates {
    writeln c, ": ", if(isCusip(c): "good" ; "bad")
}