#include <stdio.h>

int main()
{
	int a[101],n,i,t;
	scanf("%d",&n);
	for(i = 1; i <= n; i++)
		scanf("%d",&a[i]);
	for(i = 1; i <= n; i++)
		if(i%2 == 0)
		{
			t = a[i];
			a[i] = a[i-1];
			a[i-1] = t;
		}
	for(i = 1; i <= n; i++)
		printf("%d ",a[i]);
	return 0;
}