var s:string;
    L:set of char;
    cuv:array[1..100] of string;
    n,i,m,suma:byte;
    f:text;
    c:char;
begin
assign(f,'text.in');
reset(f);
read(f,s);
close(f);
assign(f,'text.out');
rewrite(f);
L:=['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'];
i:=0;n:=length(s);m:=1;
while i<=n do
 begin
 inc(i);
 c:=s[i];
 if (c in L) or ((c='-') and (s[i+1] in L)) then cuv[m]:=cuv[m]+c;
 if not(c in L) and (c<>'-') and (s[i+1] in L) then inc(m);
 end;
for i:=1 to m do
suma:=suma+length(cuv[i]);
write(f,trunc(suma/m));
close(f);
end.