%!PS

% begin included library code
% see https://github.com/Firedrake/postscript-libraries/
/test.end {
    ( ) print
    test.count 0 gt {
        (Passed ) print
        test.pass (...) cvs print
        (/) print
        test.count (...) cvs print
        ( \() print
        test.pass 100 mul test.count idiv (...) cvs print
        (%\)) print
        (\r\n) print
    } if
} bind def

/test.start {
    print (:) print
    /test.pass 0 def
    /test.count 0 def
} bind def

/test {
    /test.count test.count 1 add def
    {
        /test.pass test.pass 1 add def
    } {
        ( ) print
        test.count (....) cvs print
        (-fail) print
    } ifelse
} bind def


% end included library code

/firstunique {
    1 dict begin
    /s exch def
    /cc s length dict def
    s {
        dup
        cc exch known {
            dup cc exch get
        } {
            0
        } ifelse
        1 add
        cc 3 1 roll put
    } forall
    mark
    0 1 s length 1 sub {
        dup cc exch s exch get get 1 eq {
            exit
        } {
            pop
        } ifelse
    } for
    counttomark 0 eq {
        pop -1
    } {
        exch pop
    } ifelse
    end
} bind def

(firstunique) test.start
(Perl Weekly Challenge) firstunique 0 eq test
(Long Live Perl) firstunique 1 eq test
(aabbcc) firstunique -1 eq test
test.end