var f:text;
pre,c:char;
flag:boolean;
lit,m:longint;cuv:word;
begin
assign(f,'text.in');
reset(f);
cuv:=0;
flag:=true;
lit:=0;
read(f,c);
while (not eof(f))do
begin
   if c in ['a'..'z','A'..'Z'] then begin
                                    inc(lit);
                                    flag:=true;
                                    end
   else if flag=true then
                         begin
                            inc(cuv);
                            flag:=false;end;
   read(f,c);
   if(eof(f))and(flag=true)then inc(cuv);
end;
close(f);
assign(f,'text.out');
rewrite(f);
if(cuv<>0) then begin
                m:=lit div cuv;
                write(f,m);
                end;
close(f);
end.