#include <iostream>
#include <algorithm>
#include <vector>
#include <cstring>
#include <cstdio>
#include <climits>

using namespace std;


#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define DEB 0

int board[7][7]; //1base
int sx[2], sy[2];
static const int dx[] = {0,0,1,-1};
static const int dy[] = {1,-1,0,0};

int calc(int y, int x){
    switch(board[y][x]){
    case 1: return abs(2-y)+abs(2-x);
    case 2: return abs(2-y)+abs(3-x);
    case 3: return abs(2-y)+abs(4-x);
    case 4: return abs(3-y)+abs(1-x);
    case 5: return abs(3-y)+abs(2-x);
    case 6: return abs(3-y)+abs(3-x);
    case 7: return abs(3-y)+abs(4-x);
    case 8: return abs(3-y)+abs(5-x);
    case 9: return abs(4-y)+abs(2-x);
    case 10: return abs(4-y)+abs(3-x);
    case 11: return abs(4-y)+abs(4-x);
    }
    return -1;
}
int dist(void){
    int ret = 0;
    if( board[1][3] ) ret += calc(1,3);
    rep(i,3) if( board[2][2+i] ) ret += calc(2,2+i);
    rep(i,5) if( board[3][1+i] ) ret += calc(3,1+i);
    rep(i,3) if( board[4][2+i] ) ret += calc(4,2+i);
    if( board[5][3] ) ret += calc(5,3);
    return ret;
}
bool isgoal(void){
    if( board[1][3]!=0 ) return false;
    rep(i,3) if( board[2][2+i]!=i+1 ) return false;
    rep(i,5) if( board[3][1+i]!=i+4 ) return false;
    rep(i,3) if( board[4][2+i]!=i+9 ) return false;
    if( board[5][3]!=0 ) return false;
    return true;
}

bool dfs(int cnt, int LIM, const vector<pair<int,int> > sp){
    if( isgoal() ) return true;
    if( cnt+dist()>LIM ) return false;

    rep(i,2){
        if( board[sp[i].second][sp[i].first]!=0 ) exit(-1);
        rep(k,4){
            int tx = sp[i].first + dx[k];
            int ty = sp[i].second + dy[k];
            if( board[ty][tx]<=0 ) continue;

            swap(board[sp[i].second][sp[i].first], board[ty][tx]);

            vector<pair<int,int> > v = sp;
            pair<int,int> tmp(tx,ty);
            swap(v[i], tmp);
            if( dfs(cnt+1, LIM, v) ) return true;

            swap(board[sp[i].second][sp[i].first] ,board[ty][tx]);
        }
    }
    return false;
}
int solve(void){
    int ttx[2], tty[2];
    int tb[7][7];
    vector<pair<int,int> > sp;
    rep(i,2) sp.push_back(make_pair(sx[i],sy[i]));
    //rep(i,7)rep(j,7) tb[i][j] = board[i][j];

    for(int lim = 0; lim < 21; lim++){
        if( dfs(0,lim,sp) ) return lim;
        //rep(i,7)rep(j,7)if( board[i][j]!=tb[i][j] ) puts("ugeeeee");
    }
    return -1;
}
int main(){
    for(;;){
        memset(board, -1, sizeof(board));
        int sz = 0;

        scanf("%d",&board[1][3]); if( board[1][3]==-1 ) break;
        rep(i,3) scanf("%d",&board[2][2+i]);
        rep(i,5) scanf("%d",&board[3][1+i]);
        rep(i,3) scanf("%d",&board[4][2+i]);
        scanf("%d",&board[5][3]);

        // find space
        if( board[1][3]==0 ){ sx[sz]=3; sy[sz]=1; sz++; }
        rep(i,3) if( board[2][2+i]==0 ) { sx[sz]=2+i; sy[sz]=2; sz++; }
        rep(i,5) if( board[3][1+i]==0 ) { sx[sz]=1+i; sy[sz]=3; sz++; }
        rep(i,3) if( board[4][2+i]==0 ) { sx[sz]=2+i; sy[sz]=4; sz++; }
        if( board[5][3]==0 ){ sx[sz]=3; sy[sz]=5; sz++; }

        //printf("hoge:%d\n",dist());
        int ans = solve();
        if( ans!=-1 ) printf("%d\n",ans); else puts("NA");
    }
    return 0;
}

/*

//-------------------------------------------------------

#define N 5
#define REP(i, n) for ( int i = 0; i < (int)n; i++ )
#define LIMIT 20

static const int T[12][2] = {
    {-1, -1},
    {1, 1}, 
    {1, 2}, 
    {1, 3},
    {2, 0},
    {2, 1},
    {2, 2},
    {2, 3},
    {2, 4},
    {3, 1}, 
    {3, 2},
    {3, 3}
};
static const int g[N][N] = {
    {-1,-1, 0,-1,-1},
    {-1, 1, 2, 3,-1},
    { 4, 5, 6, 7, 8},
    {-1, 9,10,11,-1}, 
    {-1,-1, 0,-1,-1}
};

class Puzzle{
public:
    int C[N][N], mdist; //manhatta distance
    Puzzle(){}

    bool swapAdj( int si, int sj, int ti, int tj ){
        if ( ti < 0 || tj < 0 || ti >= N || tj >= N ) return false;
        if ( C[ti][tj] <= 0 ) return false;
        swap(C[ti][tj], C[si][sj]);
        int tti = T[C[si][sj]][0];
        int ttj = T[C[si][sj]][1];
        //mdist -= max(tti, ti)-min(tti, ti) + max(ttj, tj)-min(ttj, tj);
        //mdist += max(tti, si)-min(tti, si) + max(ttj, sj)-min(ttj, sj);
        //mdist -= abs(tti-ti)+abs(ttj-tj);
        //mdist += abs(tti-si)+abs(ttj-sj);
        return true;
    }

    bool isGoal(){
        REP(i, N) REP(j, N) if ( g[i][j] != C[i][j] ) return false;
        return true;
    }

    int getMD(){ // get initial manhattan distance
        int sum = 0;
        int ti, tj;
        REP(i, 5) REP(j, 5){
            if ( C[i][j] <= 0 ) continue;
            ti = T[C[i][j]][0];
            tj = T[C[i][j]][1];
            //sum += (max(ti, i)-min(ti, i) + max(tj, j) - min(tj, j));
            sum += abs(ti-i) + abs(tj-j);
        }
        return sum;
    }
};

int limit;

bool dfs( int depth, Puzzle P ){
    if ( P.isGoal() ) return true;
    if ( depth + P.getMD() > limit ) return false;

    static const int di[4] = {0, -1, 0, 1};
    static const int dj[4] = {1, 0, -1, 0};

    REP(i, N) REP(j, N){
        if ( P.C[i][j] != 0 ) continue;
        REP(r, 4){
            Puzzle v = P;
            if ( !v.swapAdj(i, j, i+di[r], j+dj[r]) ) continue;
            if ( dfs( depth + 1, v ) ) return true;
        }
    }

    return false;
}

int idp(Puzzle source){
    for ( limit = 0; limit <= LIMIT; limit++ ){
        //source.mdist = source.getMD();
        if ( dfs(0, source) ) return limit;
    }
    return INT_MAX;
}

int main(){
    Puzzle P;
    int top;

    while(1){
        cin >> top;
        if ( top == -1 ) break;
        REP(j, N) P.C[0][j] = -1;
        P.C[0][2] = top;
        for(int i = 1; i < N; i++) REP(j, N){
                if ( (i == 1 || i == 3) && (j == 0 || j == 4 ) ) P.C[i][j] = -1;
                else if ( i == 4 && j != 2 ) P.C[i][j] = -1;
                else cin >> P.C[i][j];
            }

        int cost = idp(P);
        if ( cost == INT_MAX ) cout << "NA" << endl;
        else cout << cost << endl;	
    }

    return 0;
}

*/

Measured memory_bytes: 932