/*
Author: Nguyen Chi Thanh - High School for the Gifted - VNU.HCM (i2528)
*/
#include <bits/stdc++.h>
using namespace std;
/* START OF TEMPALTE */
// #define int long long
#define ll long long
#define ull unsigned long long
#define ld long double
#define pii pair<int, int>
#define pll pair<ll, ll>
#define fi first
#define se second
#define __builtin_popcount __builtin_popcountll
#define all(x) (x).begin(), (x).end()
#define BIT(x, i) (((x) >> (i)) & 1)
#define MASK(x) (1ll << (x))
#define SZ(a) ((int32_t)a.size())
#define debug(a, l, r) {for (int _i = (l); _i <= (r); ++_i) cout << (a)[_i] << ' '; cout << '\n';}
template<class X, class Y>
bool minimize(X &x, const Y &y) {
if (x > y) {
x = y;
return true;
} else return false;
}
template<class X, class Y>
bool maximize(X &x, const Y &y) {
if (x < y) {
x = y;
return true;
} else return false;
}
/* END OF TEMPALTE */
const int MAXN = 5005;
const int INF = 1e9 + 5;
int n, m, dist[MAXN][MAXN], cnt[MAXN][MAXN];
ld res[MAXN];
vector<int> adj[MAXN];
void init() {
cin >> n >> m;
for (int i = 1; i <= m; ++i) {
int u, v; cin >> u >> v;
++u; ++v;
adj[u].push_back(v);
adj[v].push_back(u);
}
}
void process_source(int u) {
for (int i = 1; i <= n; ++i) dist[u][i] = INF;
dist[u][u] = 0;
cnt[u][u] = 1;
queue<int> qu; qu.push(u);
while (!qu.empty()) {
int cur = qu.front();
qu.pop();
for (int v : adj[cur]) {
if (dist[u][v] > dist[u][cur] + 1) {
dist[u][v] = dist[u][cur] + 1;
cnt[u][v] = cnt[u][cur];
qu.push(v);
} else if (dist[u][v] == dist[u][cur] + 1) {
cnt[u][v] += cnt[u][cur];
}
}
}
}
void solve() {
for (int i = 1; i <= n; ++i)
process_source(i);
int k; cin >> k;
while (k--) {
int u, v; cin >> u >> v;
++u; ++v;
for (int i = 1; i <= n; ++i) {
if (dist[u][i] + dist[i][v] == dist[u][v]) {
ll numpath = 1ll * cnt[u][i] * cnt[i][v];
ll totalpath = cnt[u][v];
ld ev = 1.0 * numpath / totalpath;
res[i] += ev;
}
}
}
ld mx = res[1]; int opt = 1;
for (int i = 2; i <= n; ++i) {
if (res[i] > mx) {
mx = res[i];
opt = i;
}
}
cout << opt - 1;
}
signed main() {
#ifdef NCTHANH
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif
ios_base::sync_with_stdio(0);
cin.tie(nullptr); cout.tie(nullptr);
init();
solve();
return 0;
}
