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#include <cstdio>

int main() {
	int ones = 0;
	int ile;
	scanf("%d", &ile);
	for (int i=0; i<ile; ++i) {
		int temp;
		scanf("%d", &temp);
		if (temp == 1)
			ones++;
		if (ones == 2)
			break;
	}

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

	return 0;
}