#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <climits>
#include <cfloat>
#include <map>
#include <utility>
#include <set>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <sstream>
#include <complex>
#include <stack>
#include <queue>
#include <cstring>
#include <sstream>
#include <cassert>
#include <list>
using namespace std;
static const double EPS = 1e-10;
typedef long long ll;
typedef pair<int,int> PI;
typedef vector<int> vi;
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
#define rep(i,n) for(int i=0;i<(int)n;++i)
#define FOR(i,c) for(__typeof((c).begin())i=(c).begin();i!=(c).end();++i)
#define ALL(c) (c).begin(), (c).end()
#define mp(a,b) make_pair(a,b)
#define pb(a) push_back(a)
#define F first
#define S second
template <typename T> string print_array(const vector<T> &V) { ostringstream os; os << "{ "; for (typename vector<T>::const_iterator iter = V.begin(); iter != V.end(); ++iter) os << '\"' << *iter << "\","; os << " }"; return os.str(); }

int dx[]={0,1,0,-1},dy[]={1,0,-1,0};

vector<int> se[13];
int x[]={0,-1,0,1,-2,-1,0,1,2,-1,0,1,0};
int y[]={2,1,1,1,0,0,0,0,0,-1,-1,-1,-2};

void pr(ll in){

  printf("      %3lld\n",in&15);
  printf("   %3lld%3lld%3lld\n",(in>>4)&15,(in>>8)&15,(in>>12)&15);
  printf("%3lld%3lld%3lld%3lld%3lld\n",(in>>16)&15,(in>>20)&15,(in>>24)&15,(in>>28)&15,(in>>32)&15);
  printf("   %3lld%3lld%3lld\n",(in>>36)&15,(in>>40)&15,(in>>44)&15);
  printf("      %3lld\n",(in>>48)&15);
  puts("");
}

int manh(ll in){
  int ret=0;
  rep(i,13){
    int t=(in>>(i*4))&15;

    if(!t){
      int nx=x[t]-x[i],ny=y[t]-y[i];
      int co=abs(nx)+abs(ny);
      nx=x[12]-x[i],ny=y[12]-y[i];
      int k=abs(nx)+abs(ny);
      ret+=min(co,k);
      continue;
    }
    int nx=(x[t]-x[i]),ny=y[t]-y[i];
    ret+=abs(nx)+abs(ny);
  }
  return ret;
}

main(){
  ll p;

  ll goal=0;
  rep(i,11){
    goal|=(i+1LL)<<(4*(i+1));
    //cout<<goal<<endl;
    //pr(goal);
  }
  //pr(goal);

  se[0].pb(2);
  se[1].pb(2);
  se[1].pb(5);
  se[2].pb(0);
  se[2].pb(1);
  se[2].pb(3);
  se[2].pb(6);
  se[3].pb(2);
  se[3].pb(7);
  se[4].pb(5);
  se[5].pb(1);
  se[5].pb(4);
  se[5].pb(6);
  se[5].pb(9);
  se[6].pb(2);
  se[6].pb(5);
  se[6].pb(7);
  se[6].pb(10);
  se[7].pb(3);
  se[7].pb(6);
  se[7].pb(8);
  se[7].pb(11);
  se[8].pb(7);
  se[9].pb(5);
  se[9].pb(10);
  se[10].pb(6);
  se[10].pb(9);
  se[10].pb(11);
  se[10].pb(12);
  se[11].pb(7);
  se[11].pb(10);
  se[12].pb(10);
  
  while(cin>>p){
    if(p==-1)break;
    ll in=p;

    rep(i,12){
      cin>>p;
      in|=p<<(4*(i+1));
    }

    set<ll> app;

    queue<pair<int,ll> > Q;
    app.insert(in);
    Q.push(mp(0,in));
    int ans=21;
    int mans=0;

    while(!Q.empty()){
      ll cvec=Q.front().S;
      int ccost=Q.front().F;
      Q.pop();
    
      //pr(cvec);

      //if(ccost>3)break;
     if(ccost>20)break;
     
      if(cvec==goal){
	ans=ccost;
	break;
      }
      if(ccost+manh(cvec)>29)continue;
      rep(i,13){
	ll t=cvec>>(i<<2);
	t=t&15;
	if(!t){
	  rep(j,se[i].size()){
	    t=cvec>>(se[i][j]<<2);
	    t=t&15;
	    if(t){
	      ll nvec=cvec;
	      t=t<<(i<<2);
	      nvec|=t;
	      nvec&=~(15LL<<se[i][j]*4);
	      
	      if(!app.count(nvec)){
		app.insert(nvec);
		Q.push(mp(ccost+1,nvec));
	      }
	    }
	  }
	}
      }
    }
    if(ans==21)cout<<"NA"<<endl;
    else cout<<ans<<endl;
  }
}

Measured memory_bytes: 3308