var t:text; s,sep,cuv:string; i,k,x,y,nrc:integer; lm:real;

begin
assign(t,'text.in'); reset(t);
read(t,s);
close(t);

k:=0;
sep:=' ,.;!?-';
for i:=1 to length(s) do begin x:=pos(s[i],sep);
                               y:=pos(s[i-1],sep);
                               if (x=0) and (y<>0) then inc(k);
                               end;

while pos(' ',s)<>0 do delete(s,pos(' ',s),1);
while pos(',',s)<>0 do delete(s,pos(',',s),1);
while pos('-',s)<>0 do delete(s,pos('-',s),1);
while pos('!',s)<>0 do delete(s,pos('!',s),1);

nrc:=length(s);
lm:=nrc/k;



assign(t,'text.out'); rewrite(t);
writeln(t,trunc(lm));
close(t);
end.