long long n, a[15];
int mask[15];
int m;
int if1;
int ans[15];
int cnt;

void gen(int len)
{
    if (len == m)
    {
        long long sum = 0;
        int ccnt = 0;
        for (int i = 0; i < m; ++i)
        {
            sum += a[i] * mask[i];
            ccnt += mask[i];
        }
        if (sum == n)
        {
            if (ccnt < cnt)
            {
                cnt = ccnt;
                for (int i = 0; i < m; ++i)
                    ans[i] = mask[i];
            }
        }
        if (sum > n)
            if1 = 1;
    }
    else
    {
        for (int i = 0; i <= 2; ++i)
        {
            mask[len] = i;
            gen(len + 1);
        }
    }
}

int main()
{
    cnt = 31;
    cin >> n >> m;
    for (int i = 0; i < m; ++i)
        cin >> a[i];
    gen(0);
    if (cnt == 31)
    {
        if (if1)
            cout << 0;
        else
            cout << 1;
    }
    else
    {
        cout << cnt << "\n";
        for (int i = 0; i < m; ++i)
        {
            for (int j = 0; j < ans[i]; ++j)
                cout << a[i] << " ";
        }
    }
    return 0;
}