#include <stdio.h>

int main(void){
	int num = 0;
	scanf("%d",&num);
	printf("%d",num);
	
	int val[num];
	int *p = val;
	for(int i = 0;i < num;i++){
		scanf("%d",&p[i]);
		printf("%d ",p[i]);
	}
	printf("\n");
	if(num % 2 == 0){
		
	}else{
		
	}
}