#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<int, int>;
using LP = pair<ll, ll>;
template <class T>
istream& operator>>(istream& is, vector<T>& v) {
  for (T& t : v) {
    is >> t;
  }
  return is;
}
template <class T>
ostream& operator<<(ostream& os, const vector<T>& v) {
  for (T t : v) {
    os << t << " ";
  }
  os << "\n";
  return os;
}
void Yes(bool b) { cout << (b ? "Yes" : "No") << endl; }
void YES(bool b) { cout << (b ? "YES" : "NO") << endl; }
template <class T>
inline bool chmin(T& a, T b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
template <class T>
inline bool chmax(T& a, T b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
const int inf = 1001001001;
const ll linf = 1001001001001001001;
const int mod = 1000000007;
struct mint {
  ll x;
  mint(ll x = 0) : x((x % mod + mod) % mod) {}
  mint operator-() const { return mint(-x); }
  mint& operator+=(const mint a) {
    if ((x += a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator++() {
    x += 1;
    return *this;
  }
  mint& operator-=(const mint a) {
    if ((x += mod - a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator--() {
    x -= 1;
    return *this;
  }
  mint& operator*=(const mint a) {
    (x *= a.x) %= mod;
    return *this;
  }
  mint operator+(const mint a) const {
    mint res(*this);
    return res += a;
  }
  mint operator-(const mint a) const {
    mint res(*this);
    return res -= a;
  }
  mint operator*(const mint a) const {
    mint res(*this);
    return res *= a;
  }
  bool operator==(const int n) const {
    mint a(n);
    return this->x == a.x;
  }
  bool operator==(const ll n) const {
    mint a(n);
    return this->x == a.x;
  }
  bool operator!=(const int n) const {
    mint a(n);
    return this->x != a.x;
  }
  bool operator!=(const ll n) const {
    mint a(n);
    return this->x != a.x;
  }
  mint pow(ll t) const {
    if (!t) return 1;
    mint a = pow(t >> 1);
    a *= a;
    if (t & 1) a *= *this;
    return a;
  }
  mint inv() const { return pow(mod - 2); }
  mint& operator/=(const mint a) { return (*this) *= a.inv(); }
  mint operator/(const mint a) const {
    mint res(*this);
    return res /= a;
  }
};
istream& operator>>(istream& is, const mint& m) { return is >> m.x; }
ostream& operator<<(ostream& os, const mint& m) { return os << m.x; }
int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  cout.tie(nullptr);
  int n, m;
  cin >> n >> m;
  vector<int> x(n), y(m);
  cin >> x >> y;
  mint ans = 0;
  for (int i = 0; i < n - 1; ++i)
    for (int j = 0; j < m - 1; ++j) {
      mint nans = (ll)(x[i + 1] - x[i]) * (y[j + 1] - y[j]);
      nans *= i + 1;
      nans *= n - 1 - i;
      nans *= j + 1;
      nans *= m - 1 - j;
      ans += nans;
    }
  cout << ans << endl;
}
