program litere;
uses crt;
var a:char;
    nrl,i:longint;
    nrc:word;
    f,g:text;
begin
     assign(f,'text.in');
     assign(g,'text.out');
     reset(f);
     rewrite(g);
     nrc:=1;
     nrl:=0;
     repeat
           read(f,a);
           if (a in ['A'..'Z'])or(a in['a'..'z'])then
              nrl:=nrl+1
           else
               if (a=' ')or(a='-')or(a='+')or(a='*')or(a='/') then
                  nrc:=nrc+1;
     until eof(f);
    writeln(g,trunc(nrl/nrc));
    close(f);
    close(g);
end.