#include<stdio.h>
int n,i,j,max,L[100000],pmax,T[100000];
int v[100000];
int main(){
	FILE* f =fopen("scmax.in","r");
	FILE* g =fopen("scmax.out","w");
	fscanf(f,"%d",&n);
	for(i=1;i<=n;i++)
		fscanf(f,"%d",&v[i]);
	L[1]=1;
	for(i=2;i<=n;i++){
		max=0;
		pmax=0;
		for(j=1;j<i;j++)
			if(v[i]>v[j] && v[j]>max){
				max=L[j];
				pmax=j;
			}
		L[i]=max+1;
		T[i]=pmax;
	}
	max=0;
	for(j=1;j<=i;j++)
		if(L[j]>max)
			max=L[j];
	fprintf(g,"%d\n",max);
	max=0;
	for(i=1;i<=n;i++)
		if(T[i]!=0)
			fprintf(g,"%d ",v[T[i]]);
	//for(i=max;i>=1;i--)
	//	fprintf(g,"%d ",v[T[i]]);
	
	
	
	
	
	fclose(f);
	fclose(g);
return 0;
}