Program zad;
Uses Crt;
const n=50;
type vector=array[1..n] of real;
var
k:integer;
x,y:vector;
procedure coord(var x,y:vector);
var
k:integer;
a:real;
begin
for k:=1 to n do begin
if x[k]<y[k] then begin
a:=x[k];
x[k]:=y[k];
y[k]:=a;
end;
end;
end;
begin
Clrscr;
for k:=1 to n do
readln(x[k],y[k]);
coord(x,y);
readln;
end.