Problem: This is an interactive problem.

Note: the XOR-sum of an array a_1, a_2, …, a_n (1 ≤ a_i ≤ 10^9) is defined as a_1 ⊕ a_2 ⊕ … ⊕ a_n, where ⊕ denotes the [bitwise XOR operation](https://en.wikipedia.org/wiki/Bitwise_operation#XOR).

Little Dormi received an array of n integers a_1, a_2, …, a_n for Christmas. However, while playing with it over the winter break, he accidentally dropped it into his XOR machine, and the array got lost.

The XOR machine is currently configured with a query size of k (which you cannot change), and allows you to perform the following type of query: by giving the machine k distinct indices x_1, x_2, …, x_k, it will output a_{x_1} ⊕ a_{x_2} ⊕ … ⊕ a_{x_k}.

As Little Dormi's older brother, you would like to help him recover the XOR-sum of his array a_1, a_2, …, a_n by querying the XOR machine.

Little Dormi isn't very patient, so to be as fast as possible, you must query the XOR machine the minimum number of times to find the XOR-sum of his array. Formally, let d be the minimum number of queries needed to find the XOR-sum of any array of length n with a query size of k. Your program will be accepted if you find the correct XOR-sum in at most d queries.

Lastly, you also noticed that with certain configurations of the machine k and values of n, it may not be possible to recover the XOR-sum of Little Dormi's lost array. If that is the case, you should report it as well.

The array a_1, a_2, …, a_n is fixed before you start querying the XOR machine and does not change with the queries.

Input

The only line of input contains the integers n and k (1 ≤ n ≤ 500, 1 ≤ k ≤ n), the length of the lost array and the configured query size of the XOR machine.

Elements of the original array satisfy 1 ≤ a_i ≤ 10^9.

It can be proven that that if it is possible to recover the XOR sum under the given constraints, it can be done in at most 500 queries. That is, d ≤ 500.

After taking n and k, begin interaction.

Output

If it is impossible to recover the XOR-sum of the array, output -1 immediately after taking n and k. Do not begin interaction.

Otherwise, when your program finds the XOR-sum of the lost array a_1, a_2, …, a_n, report the answer in the following format: "! x", where x is the XOR sum of the array a_1, a_2, …, a_n, and terminate your program normally immediately after flushing the output stream. 

Note that answering does not count as a query.

Interaction

Each query is made in the format "? b", where b is an array of exactly k distinct integers from 1 to n denoting the indices of the elements in the lost array that you want to query the XOR sum of.

You will then receive an integer x, the XOR sum of the queried elements. It can be proven that 0 ≤ x ≤ 2 ⋅ 10^9 will always be true.

After printing a query do not forget to output end of line and flush the output. Otherwise, you will get Idleness limit exceeded. To do this, use:

  * fflush(stdout) or cout.flush() in C++; 
  * System.out.flush() in Java; 
  * flush(output) in Pascal; 
  * stdout.flush() in Python; 
  * see documentation for other languages.



If at any point you make an invalid query or try to make more than 500 queries (which is the hard limit), the interaction will terminate immediately and give you a Wrong Answer verdict. Note that if you exceed d queries, the interaction will continue normally unless you also exceed the 500 query hard limit, though you will still receive a Wrong Answer verdict either way.

Hacks

To hack a solution, use the following format.

The first line contains the integers n and k (1 ≤ n ≤ 500, 1 ≤ k ≤ n).

The second line contains the the array a_1, a_2, …, a_n (1 ≤ a_i ≤ 10^9).

Examples

Input


5 3

4

0

1


Output


? 1 2 3

? 2 3 5

? 4 1 5

! 7


Input


3 2


Output


-1

Note

In the first example interaction, the array a_1, a_2, …, a_n is 2, 1, 7, 5, 6 and its XOR-sum is 7. 

The first query made asks for indices 1,2,3, so the response is a_1 ⊕ a_2 ⊕ a_3 = 2 ⊕ 1 ⊕ 7 = 4.

The second query made asks for indices 2,3,5, so the response is a_2 ⊕ a_3 ⊕ a_5 = 1 ⊕ 7 ⊕ 6 = 0.

The third query made asks for indices 4,1,5, so the response is a_4 ⊕ a_1 ⊕ a_5 = 5 ⊕ 2 ⊕ 6 = 1. Note that the indices may be output in any order.

Additionally, even though three queries were made in the example interaction, it is just meant to demonstrate the interaction format and does not necessarily represent an optimal strategy.

In the second example interaction, there is no way to recover the XOR-sum of Little Dormi's array no matter what is queried, so the program immediately outputs -1 and exits.

Solution (in CPP):

Solution:
#pragma GCC optimize("O3")
#include <algorithm>
#include <string>
#include <set>
#include <map>
#include <vector>
#include <queue>
#include <iostream>
#include <iterator>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <sstream>
#include <fstream>
#include <ctime>
#include <cstring>
#include <stack>
#include <ctime>
#include <iomanip>
#include <random>
#include <unordered_map>
#include <unordered_set>
#include <bitset>

//#include <ext/pb_ds/assoc_container.hpp>

#define fi first
#define se second
#define th third

#define en "\n"
#define sqrt(n) sqrt((long double) n)
#define ALL(c) (c).begin() , (c).end()
#define MOD 998244353
#define MEM0(a) memset(a,0,sizeof(a))
#define FAST() ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define FILES(name) name!=""?freopen(name".in","r",stdin),freopen(name".out","w",stdout):0
#define elif else if
#define SORT(x) sort(ALL(x))
#define REVERSE(x) reverse(ALL(x))
#define SZ(a) ((long long)((a).size()))
#define WHAT_IS(x) cerr << #x << " is " << x << en
#define TIMER (clock()*1.0/CLOCKS_PER_SEC)
#define int long long


using namespace std;

template<class A, class B, class C> struct triple { A first; B second; C third;
    bool operator<(const triple& t) const { if (first != t.first) return first < t.first; if (second != t.second) return second < t.second; return third < t.third; } };


typedef unsigned long long ull;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<pii> vpii;
typedef set<int> seti;
typedef long double ld;
typedef pair<ld, ld> pdd;
typedef triple<int, int, int> tiii;


const ld EPS=0.000000001;
const ld INFD32=1000000000;
const ll INF64=1000000000000000000;
const ll INF32=1000000000;
const ll one=1;

bool iss_ll(ll __1,ll __2){ return INF64/__1>=__2;}
bool equal(double _1,double _2){ return (abs(_1-_2)<EPS);}
bool iss_sqr(const int &__1){ll __2=sqrt(__1); return __2*__2==__1;};
bool iss_prime(ll __1){for (int i=2; i*i<=__1; ++i) if (!(__1%i)) return 0; return 1;}



int gcd(int __1,int __2){ while (__1 && __2) if (__1>__2)  __1=__1%__2; else __2=__2%__1; return __1+__2;}
int lcm(int __1,int __2){ return __1*__2/(gcd(__1, __2));}
int sq_cube(ll x){if (x==0) return 1;int l=0,r=2e6;while (l+1<r){int m=(l+r)/2;if (m*m*m>x) r=m;else l=m;}return l;}
ll bp(ll a,ll b,ll md){ll res=1;while (b) {if (b&1) res*=a;a*=a;a%=md;res%=md;b>>=1;}return res;}
ll inv(ll x,ll md) {return bp(x, md - 2, md);}


void update_by_mod(int &x,int md){
    x%=md;
    if (x<0) x+=md;
}

void update_by_mod(int &x,int &y,int md){
    update_by_mod(x,md);
    update_by_mod(y,md);
}
void update_by_mod(int &x,int &y,int &z,int md){
    update_by_mod(x,md);
    update_by_mod(y,md);
    update_by_mod(z,md);
}
void update_by_mod(int &x,int &y,int &z,int &a,int md){
    update_by_mod(x,md);
    update_by_mod(y,md);
    update_by_mod(z,md);
    update_by_mod(a,md);
}


template <class T>
T sqr(T x){
    return x*x;
}

/*

#define maxN 444

int fact[maxN],rfact[maxN];

void bld(int md) {
    fact[0] = 1;
    for (int i = 1; i < maxN; ++i) {
        fact[i] = fact[i - 1] * i % md;
    }
    rfact[maxN - 1] = bp(fact[maxN - 1], md - 2, md);
    for (int i = maxN - 2; i >= 0; --i) {
        rfact[i] = rfact[i + 1] * (i + 1) % md;
    }
}

int C(int n,int k,int md) {
    if (k > n) return 0;
    int res = fact[n];
    res *= rfact[k];
    res %= md;
    res *= rfact[n - k];
    res %= md;
    return res;
}
*/


#define maxN 500500

void preCalc(){

}

int cnt[maxN];
void solve() {
    int n,k;
    cin>>n>>k;
    if (n%2 && k%2==0){
        cout<<-1<<en;
        return;
    }
    if (n%k==0){
        int ans=0;
        for (int j=0; j<n/k; ++j){
            cout<<"? ";
            for (int i=j*k+1; i<=k*(j+1); ++i){
                cout<<i<<" ";
            }
            cout<<endl;
            int x;
            cin>>x;
            ans^=x;

        }
        cout<<"! "<<ans<<endl;
        return;
    }
    for (int i=0; i<n; ++i) cnt[i]=1;
    int sum=n;
    int pos=0;
    while (sum%k || sum/k<3){
        cnt[pos]+=2;
        pos++;
        pos%=n;
        sum+=2;
    }
    //cout<<sum<<en;
    vpii VEC;
    int ans=0;
    for (int i=0; i<n; ++i){
        VEC.push_back({cnt[i],i+1});
    }
    SORT(VEC);
    while (VEC.front().first!=0 || VEC.back().first!=0){
        SORT(VEC);
        REVERSE(VEC);
        cout<<"? ";
        for (int j=0; j<k; ++j){
            VEC[j].first--;
            cout<<VEC[j].second<<" ";
        }
        cout<<endl;
        int x;
        cin>>x;
        ans^=x;
        SORT(VEC);
        if (VEC.front().first<0){
            for (int i=0; i<k; ++i) VEC[i].first+=2;
        }
        SORT(VEC);
    }
    cout<<"! "<<ans<<endl;
}

signed main(void) {
    //look at the end
    srand(time(NULL));
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    //cerr<<TIMER<<en;
    preCalc();
    int t = 1;
    //cin >> t;
    for (int i = 1; i <= t; ++i) {
        //cout<<"Case #"<<i<<": ";
        solve();
    }
    cerr<<TIMER<<en;
    return 0;
}
//check special cases for example (n==1)
//check size  arrays