uses crt;
type slov=^slovo;
     slovo=record
     sim:char;
     ss:slov;
     end;
     spisok=^zveno;
     zveno=record
     sl:slov;
     cc:spisok;
     end;
var s,s1,s2:spisok;
    t:text;
    b,i:word;
begin
clrscr;
assign(t,'C:/f1.txt');
reset(t);
s1:=nil;
while not eof(t) do begin
new(s);
s2^.sl:=nil;
  while not eoln(t) do begin
   new(s^.sl);
   read(t,s^.sl^.sim);
   s^.sl^.ss:=s2^.sl;
   s2^.sl:=s^.sl;
  end;
readln(t);
s^.cc:=s1;
s1:=s;
end;
close(t);

while s<>nil do begin
while s^.sl<>nil do begin
  write(s^.sl^.sim);
  s^.sl:=s^.sl^.ss;
end;
writeln;
s:=s^.cc;
end;