1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | #include <bits/stdc++.h>
using namespace std;
int main() {
int n;
scanf("%d", &n);
int ones = 0;
while (n--) {
int a;
scanf("%d", &a);
ones += a == 1;
}
printf("%d\n", max(0, 2 - ones));
printf("2\n1 2\n");
return 0;
}
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