#include <stdio.h>
#define MAX 100002

int a[MAX],best[MAX],honnan[MAX],max=0,utolso,n;


int main(){
	freopen("scmax.in","r",stdin);
	freopen("scmax.out","w",stdout);
	
	scanf("%d",&n);
	
	int i,j,maxx,temp;
	
	for(i=1;i<=n;i++){
		
		scanf("%d",&a[i]);
		
	}
	
	for(i=1;i<=n;i++){
		
		maxx=0;
		for(j=1;j<=i-1;j++){
			
			if((best[j]>maxx)&&(a[j]<a[i])){
			maxx=best[j];
			honnan[i]=j;
			}
		}
		
		best[i]=maxx+1;
		if(best[i]>max){max=best[i];utolso=i;}
	}
	
	
	temp=utolso;
	
	for(i=1;i<=max;i++){
		best[i]=a[temp];
		temp=honnan[temp];		
	}
	
	printf("%d\n",max);
	
	for(i=max;i>=1;i--){
		printf("%d ",best[i]);
	}
	
	return 0;}