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#include <cstdio>
using namespace std;
int main(){
    int n, a, cnt = 0;
    scanf("%d", &n);
    for(int i=0; i<n; i++){
        scanf("%d", &a);
        if(a == 1) cnt++;
    }

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