#include <stdio.h>
#include <assert.h>

void swap(int* a, int* b){
	
	int c = *a;
	*a = *b;
	*b = c;
	
}

int main(){
	int a, b, olda, oldb;
	scanf("%i %i", &a, &b);
	olda = a; oldb = b;
	swap(&a, &b);
	assert(a == oldb && b == olda);
}