#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<math.h>
void swap(int* x,int* y)
{
	int tmp = 0;
	tmp = *x;
	*x = *y;
	*y = tmp;
}
int main()
{
	int x = 0, y = 0;
	scanf("%d %d", &x, &y);
	printf("ǰ:%d %d\n", x, y);
	swap(&x, &y);
	printf(":%d %d\n", x, y);
	return 0;
}