const litere=['A'..'Z'];
var c1,c2:char;
    l,c:byte;
begin
//assign(input,'text.in');reset(input);
//assign(output,'text.out');rewrite(output);
 l:=0;c:=0;
 while not eoln do begin
   read(c1);
   if (upcase(c1) in litere)and(ord(c1)-47<9+1)and(ord(c1)-47>0-1) then inc(l);
   if (upcase(c1) in litere)and (not(upcase(c2) in litere)) then inc(c);
   c2:=c1;
 end;
 if (upcase(c1) in litere)and (not(upcase(c2) in litere)) then inc(c);
 if l=0 then writeln(l)
        else writeln(l div c);
//close(input);close(output);
end.