#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

/*
  1 = [2][2]
  2 = [2][3]
  3 = [2][4]
  4 = [3][1]
  5 = [3][2]
  6 = [3][3]
  7 = [3][4]
  8 = [3][5]
  9 = [4][2]
  10= [4][3]
  11= [4][4]
*/
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};

/*
(y,x)
 */
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, int py, int px){
    if( LIM<cnt ) return false;
    if( isgoal() ) return true;
    if( cnt+dist()>23 ) return false;

    rep(i,2){
        rep(k,4){
            int tx = sx[i] + dx[k];
            int ty = sy[i] + dy[k];
            if( board[ty][tx]==-1 || ty==py&&tx==px ) continue;
            swap(board[sy[i]][sx[i]], board[ty][tx]);
            swap(sx[i], tx); swap(sy[i],ty);
            if( dfs(cnt+1, LIM, ty, tx) ) return true;
            swap(sx[i], tx); swap(sy[i],ty);
            swap(board[sy[i]][sx[i]] ,board[ty][tx]);
        }
    }
    return false;
}
int solve(void){
    int ttx[2], tty[2];
    rep(i,2) ttx[i]=sx[i], tty[i]=sy[i];

    for(int lim = 0; lim < 21; lim++){
        rep(i,2) sx[i]=ttx[i], sy[i]=tty[i];
        if( dfs(0,lim,-1,-1) ) return lim;
    }
    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++; }

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