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#include <cstdio>

using namespace std;

int main() {
	int n; 
	scanf("%d", &n);

	int num1 = 0;			//oczekiwana ilosc lisci
	for (int i = 0; i < n; i++) {
		int tmp;
		scanf("%d", &tmp);
		if (tmp == 1) num1++;
	}

	if (num1 >= 2) {
		printf("0");
	}else if(num1 == 1){
		printf("1");
	}else { // num1 == 0
		printf("2");
	}
	printf("\n2\n1 2");
}