Var x, y, b: integer;
begin
write ('Input first number: ');
readln (x);
write ('Input second number: ');
readln (y);
writeln ('x = ', x, ', y = ', y);
writeln ('Changing values... changing values...');
b := x;
x := y;
y := b;
writeln ('x = ', x, ', y = ', y);
readln
end.