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#include <iostream>
#include <cstdio>
#include <vector>
using namespace std;

int n, tab[1000100], one, wyn[10];
//***************************************************************************************
int main()
{
    scanf("%d", &n);
    for(int i = 0; i < n; i++) {
        int a;
        scanf("%d", &a);
        if (a == 1) {
            if(one < 2) wyn[one] = i + 1;
            one++;
        }
    }

    if (one == 0) printf("2\n");
    else if (one == 1) printf("1\n");
    else printf("0\n");
    printf("2\n1 2\n");
}