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#include <stdio.h>
#include <iostream>
#include <vector>

int main()
{
    int n;
    scanf("%u", &n);

    int ones = 0;

    for (int i = 0; i < n; ++i)
    {
        int rank;
        scanf("%u", &rank);
        if (rank == 1)
            ++ones;
    }

    if (ones > 1)
        ones = 2;

    printf("%u\n", 2 - ones);
    printf("2\n");
    printf("1 2\n");
    return 0;
}