#include using namespace std;
// write your code here
void swap(int *a,int *b)//形参定义为指向a,b的指针
{
//定义一个参数来交换a,b所指向的数值
int t=*a;
*a=*b;
*b=t;
}
int main() {
int m, n;
cin >> m;
cin >> n;
// write your code here......
swap(m,n);//将m,n的值传递给形参
cout << m << " " << n << endl;
return 0;
}