#include <bits/stdc++.h>
#pragma warning(disable : 4996)
using namespace std;
string str;
string record[100030];
int n;
long long v[11], len[11];
const int MOD = 1e9 + 7;
int quickpow(long long a, long long b) {
  long long r = 1, base = a;
  while (b != 0) {
    if (b & 1) r *= base;
    base *= base;
    b >>= 1;
  }
  return r;
}
void init() {
  for (int i = 0; i < 10; i++) {
    v[i] = i;
    len[i] = 10;
  }
}
void Change(int r, string s) {
  if (s.length() == 3) {
    v[r] = 0;
    len[r] = 1;
    return;
  }
  int L = s.length();
  long long val = 0;
  long long l = 1;
  for (int i = 3; i < L; i++) {
    int t = (s[i] - '0');
    val = ((val * len[t] + v[t]) % MOD);
    l = (l * len[t]) % MOD;
  }
  len[r] = l;
  v[r] = val;
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cin >> str;
  cin >> n;
  init();
  for (int i = 0; i < n; i++) cin >> record[i];
  for (int i = n - 1; i >= 0; i--) {
    int r = record[i][0] - '0';
    Change(r, record[i]);
  }
  int l = str.size();
  long long val = 0;
  for (int i = 0; i < l; i++) {
    int t = (str[i] - '0');
    val = ((val * len[t] + v[t]) % MOD);
  }
  cout << val << endl;
  return 0;
}
