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#include <bits/stdc++.h>
using namespace std;


int main(){
	
	int lwierz, tmp, ljed;
	scanf("%d", &lwierz);
	for(int i = 0; i < lwierz; ++i){
		scanf("%d", &tmp);
		if(tmp == 1) ++ljed;
	}

	if(ljed >= 2){
		printf("0\n2\n1 2");
		return 0;
	}
	if(ljed == 1){
		printf("1\n2\n1 2");
		return 0;
	}
	if(ljed == 0){
		printf("2\n2\n1 2");
	}
}