#include <bits/stdc++.h>
#include <atcoder/all>
//#pragma GCC target("avx2")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")
using namespace std;
using namespace atcoder;

inline void scan(int &a) {cin >> a;}
inline void scan(unsigned int &a) {cin >> a;}
inline void scan(long long &a) {cin >> a;}
inline void scan(unsigned long long &a) {cin >> a;}
inline void scan(float &a) {cin >> a;}
inline void scan(double &a) {cin >> a;}
inline void scan(long double &a) {cin >> a;}
inline void scan(char &a) {cin >> a;}
inline void scan(string &a) {cin >> a;}
inline void scan(vector<bool> &vec) {for (int i = 0; i < int(vec.size()); i++) {int a; scan(a); vec[i] = a;}}

template<typename T> inline void scan(vector<T> &vec);
template<typename T, size_t size> inline void scan(array<T, size> &vec);
template<typename T> inline void scan(deque<T> &deq);
template<typename T, typename U> inline void scan(pair<T, U> &p);

template<typename T> inline void scan(vector<T> &vec) {
    for (auto &i : vec) scan(i);
}

template<typename T, size_t size> inline void scan(array<T, size> &vec) {
    for (auto &i : vec) scan(i);
}

template<typename T> inline void scan(deque<T> &deq) {
    for (auto &i : deq) scan(i);
}

template<typename T, typename U> inline void scan(pair<T, U> &p) {
    scan(p.first); 
    scan(p.second);
}

template<typename T> inline void scan(T &a) {cin >> a;}

inline void read() {}
template<typename Head, typename... Tail> inline void read(Head &head, Tail &...tail) {
    scan(head);
    read(tail...);
} 

inline void write(const int &a) {cout << a;}
inline void write(const unsigned int &a) {cout << a;}
inline void write(const long long &a) {cout << a;}
inline void write(const unsigned long long &a) {cout << a;}
inline void write(const float &a) {cout << a;}
inline void write(const double &a) {cout << a;}
inline void write(const long double &a) {cout << a;}
inline void write(const char &a) {cout << a;}
inline void write(const string &a) {cout << a;}

template<typename T> inline void write(const vector<T> &vec);
template<typename T, size_t size> inline void write(const array<T, size> &vec);
template<typename T> inline void write(const deque<T> &deq);
template<typename T, typename U> inline void write(const pair<T, U> &p);

template<typename T> inline void write(const vector<T> &vec) {
    int n = vec.size();
    for (int i = 0; i < n; i++) {
        if (i) write(' ');
        write(vec[i]);
    }
}

template<typename T, size_t size> inline void write(const array<T, size> &vec) {
    int n = vec.size();
    for (int i = 0; i < n; i++) {
        if (i) write(' ');
        write(vec[i]);
    }
}

template<typename T> inline void write(const deque<T> &deq) {
    int n = deq.size();
    for (int i = 0; i < n; i++) {
        if (i) write(' ');
        write(deq[i]);
    }
}

template<typename T, typename U> inline void write(const pair<T, U> &p) {
    write(p.first);
    write(' ');
    write(p.second);
}

template<typename T> inline void write(const T &a) {cout << a;}

inline void print() {cout << '\n';}
template<typename T> inline void print(const T &a) {write(a); cout << '\n';}
template<typename Head, typename... Tail> inline void print(const Head &head, const Tail &...tail) {
    write(head);
    write(' ');
    print(tail...);
}

using ll = long long;
using ld = long double;
using ull = unsigned long long;
template<typename T> using pq = priority_queue<T>;
template<typename T> using pq_g = priority_queue<T, vector<T>, greater<T>>;
using mint = modint998244353;
// using mint = modint1000000007;

#define rep(i, n) for (int i = 0; i < (n); i++)
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()
#define UNIQUE(v) (v).erase(unique((v).begin(), (v).end()), (v).end())
#define dbg(x) cerr << #x << " = " << x << endl;
#define NP next_permutation
#define endl '\n'
#define INT(...) int __VA_ARGS__; read(__VA_ARGS__);
#define LL(...) long long __VA_ARGS__; read(__VA_ARGS__);
#define ULL(...) unsigned long long __VA_ARGS__; read(__VA_ARGS__);
#define STR(...) string __VA_ARGS__; read(__VA_ARGS__);
#define CHAR(...) char __VA_ARGS__; read(__VA_ARGS__);
#define LD(...) long double __VA_ARGS__; read(__VA_ARGS__);
#define VEC(type, name, size) vector<type> name(size); read(name);
#define VV(type, name, h, w) vector<vector<type>> name(h, vector<type>(w)); read(name);


inline void Yes(bool a = true) {cout << (a ? "Yes" : "No") << endl;}
inline void No(bool a = true) {cout << (a ? "No" : "Yes") << endl;}
inline void Takahashi(bool a = true) {cout << (a ? "Takahashi" : "Aoki") << endl;}
inline void Alice(bool a = true) {cout << (a ? "Alice" : "Bob") << endl;}
inline void Possible(bool a = true) {cout << (a ? "Possible" : "Impossible") << endl;}

constexpr int INF = 2e9;
constexpr ll LINF = 2e18;
constexpr ld pi = 3.14159265358979323846;
constexpr ld eps = 1e-9;
constexpr int dx[8] = {1, 0, -1, 0, 1, -1, -1, 1};
constexpr int dy[8] = {0, 1, 0, -1, 1, 1, -1, -1};

ll modPow(ll a, ll n, ll mod = LINF) {ll ret = 1; ll x = a % mod; while (n) {if (n & 1) ret = ret * x % mod; x = x * x % mod; n >>= 1;} return ret;}
template<typename T> T floor(T a, T b) {return a / b - (a % b && (a ^ b) < 0);}
template<typename T> T ceil(T a, T b) {return floor(a + b - 1, b);}
template<typename T> T bmod(T a, T b) {return a - b * floor(a, b);}
template<typename T> pair<T, T> divmod(T a, T b) {return {floor(a, b), a - b * floor(a, b)};}
template<typename T> auto MIN(const vector<T> &a) {return *min_element(all(a));}
template<typename T> auto MAX(const vector<T> &a) {return *max_element(all(a));}
template<typename T> auto SUM(const vector<T> a) {return accumulate(all(a), T(0));}
template<typename T> bool chmin(T &a, const T &b){if(a > b){a = b; return true;} return false;}
template<typename T> bool chmax(T &a, const T &b){if(a < b){a = b; return true;} return false;}

void cincout() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout << fixed << setprecision(15);
}

void solve() {
    INT(N, M);
    vector<vector<int>> G(N);
    for (int i = 0; i < M; i++) {
        INT(u, v);
        u--, v--;
        G[u].push_back(v);
        G[v].push_back(u);
    }

    vector<bool> bad(N), seen(N);
    auto bfs = [&]() {
        INT(L);
        queue<pair<int, int>> q;
        for (int i = 0; i < L; i++) {
            int j, k;
            cin >> j >> k;
            j--;
            q.push({j, k});
            seen[j] = true;
        }

        while (!q.empty()) {
            auto [v, d] = q.front();
            q.pop();
            bad[v] = true;

            for (int &next_v : G[v]) {
                if (d > 0 && !seen[next_v]) {
                    seen[next_v] = true;
                    q.push({next_v, d - 1});
                }
                
            }
        }
    };

    bfs();

    auto bfs_solve = [&]() {
        vector<int> dist(N, -1);
        queue<int> q;
        if (!bad[0]) {
            dist[0] = 0;
            q.push(0);
        }
        while (!q.empty()) {
            int v = q.front();
            q.pop();
            for (int &next_v : G[v]) {
                if (dist[next_v] == -1 && !bad[next_v]) {
                    dist[next_v] = dist[v] + 1;
                    q.push(next_v);
                }
            }
        }
        
        if (dist[N - 1] == -1) print("No");
        else {
            print("Yes");
            print(dist[N - 1]);
        }
    };

    bfs_solve();
}

int main() {
    cincout();

    int t = 1;
    // cin >> t;
    while (t--) solve();
    return 0;
}