#include <bits/stdc++.h>
using namespace std;
template <typename T>
T scani(T &n) {
  n = 0;
  bool negative = false;
  char c = getchar();
  while (c < '0' || c > '9') {
    if (c == '-') negative = true;
    c = getchar();
  }
  while (c >= '0' && c <= '9') {
    n = n * 10 + c - 48;
    c = getchar();
  }
  if (negative) n = ~(n - 1);
  return n;
}
template <typename T>
void write(T n, int type = true) {
  if (n < 0) {
    putchar('-');
    n = -n;
  }
  if (!n) {
    putchar('0');
    if (type == 32)
      putchar(' ');
    else if (type)
      putchar('\n');
    return;
  }
  char buff[22];
  int len = 0;
  while (n) buff[len++] = n % 10 + 48, n /= 10;
  for (int i = len - 1; i >= 0; i--) putchar(buff[i]);
  if (type == 32)
    putchar(' ');
  else if (type)
    putchar('\n');
}
int scans(char *a) {
  int i = 0;
  char c = 0;
  while (c < 33) c = getchar();
  while (c > 33) {
    a[i++] = c;
    c = getchar();
  }
  a[i] = 0;
  return i;
}
static inline bool isvowel(char c) {
  c = tolower(c);
  return c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u';
}
template <typename T>
inline T SqrDis(T x1, T y1, T x2, T y2) {
  return ((x1 - x2) * (x1 - x2)) + ((y1 - y2) * (y1 - y2));
}
static inline int digsum(int n) {
  int ans = 0;
  while (n) {
    ans += n % 10;
    n /= 10;
  }
  return ans;
}
const int N2 = 102;
const int N3 = 1003;
const int N4 = 10004;
const int N5 = 100005;
const int N6 = 1000006;
map<string, int> cost;
string arr[N5];
int c[N5];
int v[N5];
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(nullptr);
  ;
  int n, k, m;
  cin >> n >> k >> m;
  for (int i = (1); i < (n + 1); ++i) cin >> arr[i];
  for (int i = (1); i < (n + 1); ++i) cin >> c[i];
  int x;
  for (int _ = (0); _ < (k); ++_) {
    cin >> x;
    int cc = INT_MAX;
    for (int i = (0); i < (x); ++i) cin >> v[i], cc = min(cc, c[v[i]]);
    for (int i = (0); i < (x); ++i) cost[arr[v[i]]] = cc;
  }
  long long ans = 0;
  string s;
  for (int _ = (0); _ < (m); ++_) cin >> s, ans += cost[s];
  cout << ans;
  return 0;
}
