#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int mod = 998244353;
int main(){
	int n, m; cin >> n >> m;
	vector<ll> a(n);
	for (int i=0; i<n; i++){
		cin >> a[i];
	}
	vector ikeru(n, vector<int>(0));
	for (int i=0; i<m; i++){
		int u, v; cin >> u >> v;
		u--; v--;
		ikeru[u].push_back(v);
		ikeru[v].push_back(u);
	}	
	vector<bool> tansaku(n);
	vector<int> mada;
	ll ret = 1;
	for (int st=0; st<n; st++){
		if (tansaku[st]) continue;
		mada.push_back(st);
		tansaku[st] = true;
		ll tmp = 0;
		int num = 0;
		while(!mada.empty()){
			int i = mada.back();
			mada.pop_back();
			tmp += a[i];
			num++;
			for (int j: ikeru[i]){
				if (tansaku[j]) continue;
				tansaku[j] = true;
				mada.push_back(j);
			}
		}
		tmp %= mod;
		for (int x=0; x<num; x++){
			ret *= tmp;
			ret %= mod;
		}
	}
	cout << ret << '\n';
}