#include<stdio.h>
#define dim 101

int n,a[dim],i,j,k,x;

int main()
{
	freopen("economie.in","r",stdin);
	freopen("economie.out","w",stdout);

	scanf("%d",&n);

	for(i=1; i<=n; ++i)
	{
		scanf("%d",&a[i]);

		if(a[i]==1)
		{
			k=1;

			x=i;
		}
	}
	if(k==1)

		printf("1\n%d",x);


	return 0;

}