#include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     int n, k, m;     cin >> n >> k >> m;     map<string, int> mp;     vector<int> cost(n);     for (int i = 0; i < n; ++i) {       string str;       cin >> str;       mp[str] = i;     }     for (int i = 0; i < n; ++i) {       cin >> cost[i];     }     for (int i = 0; i < k; ++i) {       int t, mn = INT_MAX;       cin >> t;       stack<int> st;       while (t--) {         int x;         cin >> x;         --x;         st.push(x);         mn = min(mn, cost[x]);       }       while (!st.empty()) {         cost[st.top()] = mn;         st.pop();       }     }     long long sum = 0;     for (int i = 0; i < m; ++i) {       string str;       cin >> str;       sum += cost[mp[str]];     }     cout << sum;   }   