program text;

var s:string;
    l,c:integer;

procedure afisare;
var i:integer;
begin
assign(output,'text.out');
rewrite(output);
i:=int(l div c);
write(i);
close(output);
end;

procedure procesare;
var i:integer;
begin
for i:=1 to length(s) do
    if (s[i] in ['A'..'Z','a'..'z']) then
       l:=l+1
       else if (s[i-1] in ['A'..'Z','a'..'z']) and
               not (s[i] in ['A'..'Z','a'..'z']) and (l>=1) then
               inc(c);
afisare;
end;

procedure citire;
begin
assign(input,'text.in');
reset(input);
while not eof do
      begin
      readln(s);
      procesare;
      end;
close(input);
end;

begin
citire;
end.