var f,g:text;maxcuv,maxlit:longint;a:char;
begin
assign(f,'text.in');reset(f);
assign(g,'text.out');rewrite(g);
maxcuv:=0;maxlit:=0;
while not eof(f) do
begin
while not eoln(f) do begin read(f,a);
if ((ord(a)>64) and (ord(a)<91)) or ((ord(a)>96) and (ord(a)<123)) then begin
while  ((ord(a)>64) and (ord(a)<91)) or ((ord(a)>96) and (ord(a)<123))   do begin
inc(maxlit);read(f,a);end; inc(maxcuv);end;end;
readln(f);
end;
writeln(g,maxlit div maxcuv);close(f);close(g);end.