#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;

}