var a:char; nc,nl:real; buf:array[1..1 shl 17]of char; c:boolean;
begin
assign(input,'text.in'); reset(input); settextbuf(input,buf); c:=false;
while not(seekeof(input)) do begin
  read(a);
  if (a in['a'..'z']) or (a in['A'..'Z']) then begin
    if c then
      nl:=nl+1
    else begin
      c:=true;
      nc:=nc+1;
      nl:=nl+1;
    end end else begin
      c:=false;
    end;
end;
assign(output,'text.out'); rewrite(output);
if nc>0 then begin nl:=int(nl/nc); write(nl:0:0) end else write('0');
close(output);
end.