{$H+}
var  s:ansistring;
cn,i,lng:int64;
procedure check(k:int64);
var z:int64;
begin
delete(s,1,k-1);
k:=2;
while s[k]='-' do inc(k);
if s[k] in ['[',']','(',')'] then inc(cn);
if k<>length(s) then begin
z:=k+1;
while s[z]=s[k] do inc(z);
delete(s,1,z-1) ; end
 else begin z:=k; delete(s,1,z-1); end;
 
end;
begin
//assign(input,'smile.in'); reset(input);
//assign(output,'smile.out'); rewrite(output);
read(s);
 
i:=0;
while (pos(';',s)<>0) or (pos(':',s)<>0)  do begin  inc(i); if (s[i]=';') or (s[i]=':') then begin check(i); i:=0; end;
end;
writeln(cn);
close(input);
close(output);
end.
 

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;----