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#include<bits/stdc++.h>

using namespace std;

int32_t main() {
    ios_base::sync_with_stdio( 0 );
    cin.tie( 0 );

    int n;
    int ile=0;
    cin >> n;
    for( int a, i=1; i<=n; i++ ) {
        cin >> a;
        if( a == 1 ) ile++;
    }
    if( ile == 0 ) cout << "2\n";
    else if( ile == 1 ) cout << "1\n";
    else cout << "0\n";
    cout << "2\n1 2";

    return 0;
}