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#include <cstdio>

int main(int argc, char const *argv[]) {
	int n;
	scanf ("%d",&n);
	int v[n];
	for (int i = 0; i < n; ++i) {
 		scanf ("%d",&v[i]);
	}
	int ones_counter = 0;
	for (int i = 0; i < n; ++i) {
 		if (v[i] == 1) {
 			ones_counter++;
 		}
 		if (ones_counter > 2) {
 			break;
 		}
	}

	int to_change = 0;
	if (ones_counter < 2) {
		to_change = 2 - ones_counter;
	}
	printf("%d\n", to_change);
	printf("2\n");
	printf("1 2\n");
	return 0;
}