#include <iostream>
#include <cmath>
#include <queue>
#include <set>
using namespace std;

int a[13];
bool m[13][13];
int pr[] = {1, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 5};
int pc[] = {3, 2, 3, 4, 1, 2, 3, 4, 5, 2, 3, 4, 3};
long long int g;

typedef pair<int, long long int> P;

long long int encode(int *x) {
  long long int t = 0;
  for (int i=0; i<13; ++i) {
    t <<= 4;
    t |= x[i];
  }
  return t;
}

void decode(long long int s, int *x) {
  for (int i=12; i>=0; --i) {
    x[i] = (int)(s & 0xf);
    s >>= 4;
  }
}

int manhattan(int *x) {
  int y = 0;
  for (int i=0; i<13; ++i) {
    if (!x[i]) {
      continue;
    }
    y += abs(pr[x[i]] - pr[i]);
    y += abs(pc[x[i]] - pc[i]);
  }
  return y;
}

void init() {
  a[0] = a[12] = 0;
  for (int i=1; i<12; ++i) {
    a[i] = i;
  }
  g = encode(a);

  for (int i=0; i<13; ++i) {
    int r1 = pr[i];
    int c1 = pc[i];
    m[i][i] = false;
    for (int j=i+1; j<13; ++j) {
      int r2 = pr[j];
      int c2 = pc[j];
      if (((r1 == r2) && (c1 == c2 + 1 || c1 == c2 - 1))
          || ((c1 == c2) && (r1 == r2 + 1 || r1 == r2 - 1))) {
        m[i][j] = m[j][i] = true;
      } else {
        m[i][j] = m[j][i] = false;
      }
    }
  }
}

bool input() {
  int t;
  for (int i=0; i<13; ++i) {
    cin >> t;
    if (!i && t == -1) {
      return false;
    }
    a[i] = t;
  }
  return true;
}

struct Comparator {
  bool operator()(const P l, const P r) const {
    return l > r;
  }
};

int solve() {
  priority_queue<P, vector<P>, Comparator> q;
  set<long long int> u;

  long long int t;
  t = encode(a);
  q.push(make_pair(manhattan(a), t));

  while (!q.empty()) {
    P p = q.top();
    q.pop();

    if (u.find(p.second) != u.end()) {
      continue;
    }
    u.insert(p.second);

    if (p.second == g) {
      return p.first;
    }

    decode(p.second, a);
    int x = manhattan(a);
    int y = p.first - x;
    if (y >= 20) {
      break;
    }
    for (int i=0; i<13; ++i) {
      if (a[i]) {
        continue;
      }
      for (int j=0; j<13; ++j) {
        if (!m[i][j]) {
          continue;
        }
        a[i] = a[j];
        a[j] = 0;
        int z = manhattan(a);
        q.push(make_pair(y + 1 + z, encode(a)));
        a[j] = a[i];
        a[i] = 0;
      }
    }
  }
  return -1;
}

int main() {
  int ans;
  init();
  while (1) {
    if (!input()) {
      break;
    }
    ans = solve();
    if (ans >= 0) {
      cout << ans << endl;
    } else {
      cout << "NA" << endl;
    }
  }
  return 0;
}