const fi='dulieu.txt'
fo='ketqua.txt'
var f1,f2:text;
a,b,c,d:array[1..100]of integer;
i,n,dem,dem1:integer;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
n:=0;
while not eof(f1) do
begin
n:=n+1;
readln(f1,a[n],b[n]);
end;
dem:=0;
dem1:=0;
for i:=1 to n do
if a[i]>b[i] then
begin
inc(dem);
inc(dem1);
c[dem]:=a[i];
d[dem]:=b[i];
end
else begin
inc(dem);
inc(dem1);
c[dem]:=b[i];
d[dem]:=a[i];
end;
for i:=1 to dem do
write(f2,c[i]:4);
writeln(f2);
for i:=1 to dem1 do
write(f2,d[i]:4);
close(f1);
close(f2);
end.