#include <bits/stdc++.h>
using namespace std;
using ll=long long;
const ll ILL=2167167167167167167;
const int INF=2100000000;
#define rep(i,a,b) for (int i=(int)(a);i<(int)(b);i++)
#define all(p) p.begin(),p.end()
template<class T> using _pq = priority_queue<T, vector<T>, greater<T>>;
template<class T> int LB(vector<T> &v,T a){return lower_bound(v.begin(),v.end(),a)-v.begin();}
template<class T> int UB(vector<T> &v,T a){return upper_bound(v.begin(),v.end(),a)-v.begin();}
template<class T> bool chmin(T &a,T b){if(b<a){a=b;return 1;}else return 0;}
template<class T> bool chmax(T &a,T b){if(a<b){a=b;return 1;}else return 0;}
template<class T> void So(vector<T> &v) {sort(v.begin(),v.end());}
template<class T> void Sore(vector<T> &v) {sort(v.begin(),v.end(),[](T x,T y){return x>y;});}
bool yneos(bool a,bool upp=false){if(a){cout<<(upp?"YES\n":"Yes\n");}else{cout<<(upp?"NO\n":"No\n");}return a;}
template<class T> void vec_out(vector<T> &p,int ty=0){
    if(ty==2){cout<<'{';for(int i=0;i<(int)p.size();i++){if(i){cout<<",";}cout<<'"'<<p[i]<<'"';}cout<<"}\n";}
    else{if(ty==1){cout<<p.size()<<"\n";}for(int i=0;i<(int)(p.size());i++){if(i) cout<<" ";cout<<p[i];}cout<<"\n";}}
template<class T> T vec_min(vector<T> &a){assert(!a.empty());T ans=a[0];for(auto &x:a) chmin(ans,x);return ans;}
template<class T> T vec_max(vector<T> &a){assert(!a.empty());T ans=a[0];for(auto &x:a) chmax(ans,x);return ans;}
template<class T> T vec_sum(vector<T> &a){T ans=T(0);for(auto &x:a) ans+=x;return ans;}
int pop_count(long long a){int res=0;while(a){res+=(a&1),a>>=1;}return res;}
template<class T> T square(T a){return a * a;}

#include <atcoder/modint>
using mint = atcoder::modint998244353;
namespace po167{
    struct UF
    {
        using _F = int;
        int _n;
        std::vector<_F> wei;
        std::vector<int> q;
        int component;
        UF(int n):_n(n), wei(n), component(n), par(n){
            for (int i = 0; i < n; i++){
                wei[i] =1, par[i] = i;
            }
        }
        void intialize(){
            for (auto x : q){
                wei[root(x)] = 1;
                par[x] = x;
            }
            component = (int)par.size();
            q = {};
        }
        //根っこを返す
        int root(int a){
            assert(0 <= a && a < _n);
            if (a == par[a]) return a;
            return par[a] = root(par[a]);
        }
        //trueなら1,falseなら0
        int same(int a, int b){
            assert(0 <= a && a < _n);
            assert(0 <= b && b < _n);
            if(root(a) == root(b)) return 1;
            else return 0;
        }
        _F size(int a){
            return wei[root(a)];
        }
        //a,bが違う根っこの元なら結合する,結合したらtrueを返す
        bool unite(int a,int b){
            a = root(a), b = root(b);
            if (a == b) return false;
            if (wei[a] < wei[b]) std::swap(a, b);
            par[b] = a;
            q.push_back(b);
            wei[a] += wei[b];
            component--;
            return true;
        }
    private:
        std::vector<int> par;
    };
}
using po167::UF;

std::vector<std::vector<int>> tree_in(int N){
    std::vector<std::vector<int>> G(N);
    for(int i=0;i<N-1;i++){
        int a;int b;
        cin>>a>>b;
        a--,b--;
        G[a].push_back(b);
        G[b].push_back(a);
    }
    return G;
}
std::tuple<std::vector<int>,std::vector<int>,std::vector<int>> tree_order_pare_depth(std::vector<std::vector<int>> &G,int root){
    int n=G.size();
    std::vector<int> order={root},pare(n,-1),depth(n);
    pare[root]=-2;
    for(int i=0;i<n;i++){
        int a=order[i];
        for(auto x:G[a]){
            if(pare[x]==-1){
                pare[x]=a;
                depth[x]=depth[a]+1;
                order.push_back(x);
            }
        }
    }
    return {order,pare,depth};
}
std::vector<int> tree_diameter_path(std::vector<std::vector<int>> &G){
    int n=G.size();
    auto r=(std::get<0>(tree_order_pare_depth(G,0))).at(n-1);
    std::vector<int> order,pare,depth,ans;
    tie(order,pare,depth)=tree_order_pare_depth(G,r);
    int ind=order[n-1];
    while(ind!=-2){
        ans.push_back(ind);
        ind=pare[ind];
    }
    return ans;
}
void solve();
// CITRUS CURIO CITY / FREDERIC
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int t = 1;
    // cin >> t;
    rep(i, 0, t) solve();
}

void solve(){
    int N, M;
    cin >> N >> M;
    vector<mint> B(N);
    rep(i, 0, N){
        int b;
        cin >> b;
        B[i] = b;
    }
    UF T(N);
    vector<int> U(M), V(M), use(M);

    vector<vector<int>> G(N);
    vector<mint> ans(M);
    rep(i, 0, M){
        cin >> U[i] >> V[i];
        U[i]--, V[i]--;
        if (T.unite(U[i], V[i])){
            G[U[i]].push_back(V[i]);
            G[V[i]].push_back(U[i]);
            use[i] = 1;
        }
    }
    auto [order, pare, depth] = tree_order_pare_depth(G, 0);
    mint sum = 0;
    rep(i, 0, N){
        depth[i] = depth[i] % 2;
        if (depth[i]) sum += B[i];
        else sum -= B[i];
    }
    rep(i, 0, M) if (depth[U[i]] == depth[V[i]]){
        if (depth[U[i]]){
            ans[i] = sum / 2;
            B[U[i]] -= ans[i];
            B[V[i]] -= ans[i];
            sum = 0;
        }
        else{
            ans[i] = -sum / 2;
            B[U[i]] -= ans[i];
            B[V[i]] -= ans[i];
            sum = 0;
        }
    }
    if (sum != 0){
        cout << "-1\n";
        return;
    }
    vector<int> pare_ind(N);
    rep(i, 0, M) if (use[i]){
        if (pare[U[i]] != V[i]) swap(U[i], V[i]);
        pare_ind[U[i]] = i;
    }
    reverse(all(order));
    order.pop_back();
    for (auto id : order){
        mint tmp = B[id];
        // cout << id << " " << B[id].val() << endl;
        // cout << pare_ind[id] << endl;
        B[pare[id]] -= tmp;
        ans[pare_ind[id]] = tmp;
    }
    assert(B[0] == 0);
    rep(i, 0, M){
        cout << ans[i].val() << (i + 1 == M ? "\n" : " ");
    }
}