#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;
typedef tuple<int, int> duo;
const int dx[] = {0, 0, 1, -1, 1, 1, -1, -1};
const int dy[] = {1, -1, 0, 0, 1, -1, 1, -1};
const int Mod = 1000000000 + 0;
//{{{ templates
#define TT_ template<typename T>inline
#define TTF_ template<typename T,typename F>inline
TT_ T sq(T x){return x*x;}
TT_ T In(){T x;cin>>x;return x;}
TT_ void Out(T&x){cout<<x;}
TT_ void sort(T&v){sort(begin(v),end(v));}
TT_ void revs(T&v){reverse(begin(v),end(v));}
TT_ void uniq(T&v){sort(v);v.erase(unique(begin(v),end(v)),end(v));}
TT_ int ubnd(T&v,typename T::value_type&x){return upper_bound(begin(v),end(v),x)-begin(v);}
TT_ int lbnd(T&v,typename T::value_type&x){return lower_bound(begin(v),end(v),x)-begin(v);}
TTF_ void inpt(T&v,int n,F f){for(v.reserve(n);n--;v.emplace_back(f()));}
TTF_ void show(T&v,F f,string d=" ",string e="\n"){int i=0;for(auto&x:v)i++&&(cout<<d),f(x);cout<<e;}
TT_ typename T::iterator minel(T&v){return min_element(begin(v),end(v));}
TT_ typename T::iterator maxel(T&v){return max_element(begin(v),end(v));}

inline void fast_io(){ios::sync_with_stdio(0);cin.tie(0);}
inline int in(){int x;scanf("%d",&x);return x;}
inline ll pow_mod(ll a,ll k,ll m){ll r=1;for(;k>0;a=a*a%m,k>>=1)if(k&1)r=r*a%m;return r;}
inline ll mod_inv(ll a,ll p){return pow_mod(a,p-2,p);}
//}}} priority_queue queue deque front stringstream max_element min_element insert count make_tuple

struct Board {
  Board() {
    memcpy(b, "0123456789AB0", sizeof(b));
    find_zero();
    turn = 0;
  }
  Board(const vector<int>& v) {
    for (int i = 0; i < 13; i++) b[i] = conv_hex(v[i]);
    b[13] = 0;
    find_zero();
    turn = 0;
  }
  void find_zero(){
    int it = 0;
    for (int i = 0; i < 13; i++){
      if (b[i] == '0'){
        cur[it] = i;
        it++;
      }
    }
  }
  char conv_hex(int a) { return "0123456789ABCDEF"[a]; }
  ll hash(){ return strtoll(b, 0, 16); }
  bool slide(int index, int dir) {
    static const char mov[][4] = {
      {-1, -1, 2, -1},
      {-1, 2, 5, -1},
      {0, 3, 6, 1},
      {-1, -1, 7, 2},
      {-1, 5, -1, -1},
      {1, 6, 9, 4},
      {2, 7, 10, 5},
      {3, 8, 11, 6},
      {-1, -1, -1, 7},
      {5, 10, -1, -1},
      {6, 11, 12, 9},
      {7, -1, -1, 10},
      {10, -1, -1, -1},
    };
    char cu = cur[index];
    char nu = mov[cu][dir];
    if (nu == -1) return false;
    if (b[nu] == '0') return false;
    swap(b[cu], b[nu]);
    cur[index] = nu;
    turn++;
    return true;
  }
  char b[14];
  char cur[2];
  char turn;
};

void build_table(unordered_map<ll, char>& ans){
  Board b;
  queue<Board> Q;
  Q.push(b);
  while (!Q.empty()){
    Board bi = Q.front();
    Q.pop();
    ll hv = bi.hash();
    if (ans.count(hv)) continue;
    ans[hv] = bi.turn;
    if (bi.turn >= 10) continue;
    for (int i = 0; i < 2; i++){
      for (int d = 0; d < 4; d++){
        auto bii = bi;
        if (!bii.slide(i, d)) continue;
        Q.push(bii);
      }
    }
  }
}

int main() {
  unordered_map<ll, char> ans;
  build_table(ans);
  int h;
  while (h = in(), h != -1) {
    vector<int> vs;
    vs.push_back(h);
    for (int i = 0; i < 12; i++) vs.push_back(in());
    Board b(vs);
    unordered_set<ll> vis;
    queue<Board> Q;
    Q.push(b);
    while (!Q.empty()){
      Board bi = Q.front();
      Q.pop();
      ll hv = bi.hash();
      if (vis.count(hv)) continue;
      vis.insert(hv);
      if (ans.count(hv)){
        cout << (int)ans[hv] + (int)bi.turn << endl;
        goto END;
      }
      if (bi.turn >= 10) continue;
      for (int i = 0; i < 2; i++){
        for (int d = 0; d < 4; d++){
          Board bii = bi;
          if (!bii.slide(i, d)) continue;
          Q.push(bii);
        }
      }
    }
    cout << "NA\n";
END:;
  }
  return 0;
}

Measured memory_bytes: 2872