#include <cctype>
#include <cerrno>
#include <cfloat>
#include <ciso646>
#include <climits>
#include <clocale>
#include <cmath>
#include <csetjmp>
#include <csignal>
#include <cstdarg>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>

// C++
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>
using namespace std;

#define all(c) ((c).begin()), ((c).end())
#define dump(c) cerr << "> " << #c << " = " << (c) << endl;
#define iter(c) __typeof((c).begin())
#define tr(i, c) for (iter(c) i = (c).begin(); i != (c).end(); i++)
#define REP(i, a, b) for (int i = a; i < (int)(b); i++)
#define rep(i, n) REP(i, 0, n)
#define mp make_pair
#define fst first
#define snd second
#define pb push_back
#define debug( fmt, ... ) \
        fprintf( stderr, \
                  fmt "\n", \
                  ##__VA_ARGS__ \
        )

typedef unsigned int uint;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<vll> vvll;
typedef vector<vi> vvi;
typedef vector<double> vd;
typedef vector<vd> vvd;
typedef vector<string> vs;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int INF = 1 << 29;
const double EPS = 1e-10;

double zero(double d) {
    return d < EPS ? 0.0 : d;
}
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return true; } return false; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return true; } return false; }
#define UNIQUE(v) v.erase( unique(v.begin(), v.end()), v.end() );

template<typename T1, typename T2>
ostream &operator<<(ostream &os, const pair<T1, T2> &p) {
    return os << '(' << p.first << ',' << p.second << ')';
}

template<typename T>
ostream &operator<<(ostream &os, const vector<T> &a) {
    os << '[';
    rep(i, a.size()) os << (i ? " " : "") << a[i];
    return os << ']';
}

string toString(int i) {
    stringstream ss;
    ss << i;
    return ss.str();
}

const int MOD = 1000000007;
// a^k
ll fpow(ll a, ll k, int M) {
    ll res = 1ll;
    ll x = a;
    while (k != 0) {
        if ((k & 1) == 1)
            res = (res * x) % M;
        x = (x * x) % M;
        k >>= 1;
    }
    return res;
}

struct prepare {
	prepare() {
	    cout.setf(ios::fixed, ios::floatfield);
	    cout.precision(8);
	    ios_base::sync_with_stdio(false);
	}
} _prepare;

int main() {
	int N, M;
	cin >> N >> M;
    vll A(M);
    rep(i, M)
        cin >> A[i];

    vi odd, even;
    rep(i, M) {
        if(A[i] % 2 == 0)
            even.push_back(A[i]);
        else
            odd.push_back(A[i]);
    }

    if(odd.size() > 2) {
        cout << "Impossible" << endl;
        return 0;
    }

    if(M == 2 && A[0] == 1 && A[1] == 1) {
        cout << "1 1" << endl;
        cout << 1 << endl;
        cout << 2 << endl;
        return 0;
    }

    vll newA;
    if(odd.size() > 0)
        newA.push_back(odd[0]);
    tr(it, even)
        newA.push_back(*it);
    if(odd.size() > 1)
        newA.push_back(odd[1]);

    rep(i, M) {
        if(i != 0)
            cout << " ";
        cout << newA[i];
    }
    cout << endl;

    newA[0]--;

    vi B;
    ll t = accumulate(all(A), 0ll) - accumulate(all(newA), 0ll);
    rep(i, M) {
        if(newA[i] == 0)
            continue;
        B.push_back(newA[i]);
    }

    if(M == 1)
        B.push_back(t);
    else
        B[B.size()-1] += t;

    cout << B.size() << endl;
    rep(i, B.size()) {
        if(i > 0)
            cout << " ";
        cout << B[i];
    }
    cout << endl;

    return 0;
}

Measured memory_bytes: 256