program masuvu_1_14;

{$APPTYPE CONSOLE}

uses
  SysUtils;

var
  a:array[1..10000] of integer ;
  s,i,n:integer;
begin
  readln(n);
    for i:=1 to n do
  readln(a[i]);
  i:=1;
  while i<n do
  begin
  s:=a[i];
  a[i]:=a[i+1];
  a[i+1]:=s;
  i:=i+2;
  end;
  for i:=1 to n do
  writeln(a[i]);
  readln;
end.