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#include <iostream>
using namespace std;

int n;

int main() {
	int ile_1 = 0;
	cin>>n;
	
	for(int i = 0; i < n;i++) {
		int a;
		cin>>a;
		if(a == 1) {
			ile_1++;
		}
		
	}
	
	if(ile_1 <=2) {
		cout<<2-ile_1<<endl;
	} else {
		cout<<"0"<<endl;
	}
	cout<<"2"<<endl;
	cout<<"1 2"<<endl;
	
	return 0;
}