var x,y,z:real;
begin
Write('nhap x=');
Readln(x);
Write (' nhap y =');
Readln(y);
z:=x;
x:=y;
y:=z;
Write ('gia tri x la: ',x);
Write ('gia tri y la : ',y);
Readln;
end.
program bai1;
var x,y,z:longint;
f1,f2:text;
const fi='bai1.inp';
fo='bai1.out';
begin
assign(f1,fi);reset(f1);
assign(f2,fo);rewrite(f2);
readln(f1,x);readln(f1,y);
z:=x;
x:=y;
y:=z;
write(f2,x,' ',y);
close(f1);close(f2);
end.