var f,g:text;
    lunglit,nrcuv:longint;
    o,p:boolean;
    i,x:char;
begin
assign(f,'text.in');
assign(g,'text.out');
reset(f);
rewrite(g);
lunglit:=0;
nrcuv:=0;
while not eof(f) do begin
 p:=false;
 read(f,x);
 for i:='A' to 'Z' do if x=i then p:=true;
 for i:='a' to 'z' do if x=i then p:=true;
 if p then inc(lunglit)
      else if (x=' ')or(x='-')and(lunglit<>0) then  inc(nrcuv);
                       end;
o:=false;
for i:='A' to 'Z' do if x=i then o:=true;
for i:='a' to 'z' do if x=i then o:=true;
if not o then inc(nrcuv);
if (lunglit>0)and(nrcuv>0)then write(g,lunglit div nrcuv)
                          else write(g,0);
close(f);
close(g);
end.