program xaudao;
uses crt;
var st,st2,s:string;
i,j,d:byte;
begin
clrscr;
write('Nhap xau: '); readln(st);
s:=''; i:=length(st); d:=1;
while i>0 do
begin
st2:=st[i]; j:=i-1;
while (st[j]<>#32) and (j>0) do
begin
st2:=st[j]+st2;
dec(j);
end;
s:=s+st2;
if d=1 then s:=s+' ';
i:=j;
inc(d);
end;
write('Xau dao la: ',s);
readln
end.