%!PS

% begin included library code
% see https://codeberg.org/Firedrake/postscript-libraries/
/strsplit % (ajbjc) (j) -> [ (a) (b) (c) ]
{
    1 dict begin
    /sep exch def
    [ exch
      {
          dup length 0 eq {
              pop
              exit
          } {
              sep search {
                  exch pop
                  dup length 0 eq {
                      pop
                  } {
                      exch
                  } ifelse
              } {
                  ()
              } ifelse
          } ifelse
      } loop
    ]
    end
} bind def

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

/toset { % array -> dict of (value, true)
    << exch
       {
           true
       } forall
    >>
} bind def

/tolower {
    s2a
    [ exch
      {
          dup dup 65 ge exch 90 le and {
              32 add
          } if
      } forall
    ] a2s
} 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

/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

/a2s {
    2 dict begin
    /i exch def
    i length dup string /o exch def
    1 sub 0 exch 1 exch {
        dup i 3 -1 roll get o 3 1 roll put
    } for
    o
    end
} bind def

/set.intersection {
    4 dict begin
    /s 0 dict def
    /b exch def
    /a exch def
    a keys {
        /k exch def
        b k known {
            s k true put
        } if
    } forall
    s
    end
} bind def

/map { % array proc -> array
    2 dict begin
    /p exch def
    [ exch
      {
          p
      } forall
    ]
    end
} bind def

/keys { % dict -> array of dict keys
    [ exch
      {
          pop
      } forall
    ]
} bind def

/s2a {
    [ exch { } forall ]
} bind def



% end included library code

/brokenkeyboard {
    0 dict begin
    /bk exch { tolower s2a 0 get } map toset def
    0 exch
    tolower ( ) strsplit {
        /valid true def
        s2a toset bk set.intersection length 0 eq {
            1 add
        } if
    } forall
    end
} bind def

(brokenkeyboard) test.start
(Hello World) [(d)] brokenkeyboard 1 eq test
(apple banana cherry) [(a) (e)] brokenkeyboard 0 eq test
(Coding is fun) [] brokenkeyboard 3 eq test
(The Weekly Challenge) [(a) (b)] brokenkeyboard 2 eq test
(Perl and Python) [(p)] brokenkeyboard 1 eq test
test.end