program asdfa;
var s:string;
        i,n,t,cuv,r:longint;
        f,g:text;
        begin
        assign(f,'text.in');reset(f);
        read(f,s);
        close(f);
        n:=length(s);
        t:=0; cuv:=1;
        for i:=1 to n do
        begin
        if (s[i]=' ') and (s[i+1]<>' ') then
        cuv:=cuv+1;
        if ((s[i]>='A') and (s[i]<='Z')) or ((s[i]>='a') and (s[i]<='z')) then
         t:=t+1;
         end;

         assign(g,'text.out');
         rewrite(g);
         r:=t div cuv;
         write(g,r);
         close(g);
         end.