1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
#include <cstdio>
int main()
{
    int n, x, cnt = 0;
    scanf( "%d", &n );
    while ( n-- )
    {
        scanf( "%d", &x );
        if ( x == 1 && ++cnt == 2 ) break;
    }
    printf( "%d\n2\n1 2\n", 2-cnt );
}