#include <bits/stdc++.h>
using namespace std;
int main() {
  long n, m, inf = 1000000007;
  cin >> n >> m;
  long x[n + 1], y[m + 1];
  for (int i = 1; i <= n; i++) {
    cin >> x[i];
  }
  for (int i = 1; i <= m; i++) {
    cin >> y[i];
  }
  long xsum = 0, ysum = 0;
  for (long i = 1; i <= n; i++) {
    xsum += (i - 1) * x[i] % inf - (n - i) * x[i] % inf;
    xsum %= inf;
  }
  for (long i = 1; i <= m; i++) {
    ysum += (i - 1) * y[i] % inf - (m - i) * y[i] % inf;
    ysum %= inf;
  }
  cout << (xsum) * (ysum) % inf << endl;
}
