#include "bits/stdc++.h"
using namespace std;
#define int long long
#define REP(i, n) for (int i = 0; i < (int)n; ++i)
#define RREP(i, n) for (int i = (int)n - 1; i >= 0; --i)
#define FOR(i, s, n) for (int i = s; i < (int)n; ++i)
#define RFOR(i, s, n) for (int i = (int)n - 1; i >= s; --i)
#define ALL(a) a.begin(), a.end()
#define IN(a, x, b) (a <= x && x < b)
template<class T>istream&operator >>(istream&is,vector<T>&vec){for(T&x:vec)is>>x;return is;}
template<class T>inline void out(T t){cout << t << "\n";}
template<class T,class... Ts>inline void out(T t,Ts... ts){cout << t << " ";out(ts...);}
template<class T>inline bool CHMIN(T&a,T b){if(a > b){a = b;return true;}return false;}
template<class T>inline bool CHMAX(T&a,T b){if(a < b){a = b;return true;}return false;}
constexpr int INF = 1e18;



signed main(){
	int N, M, P, S, G;
	cin >> N >> M >> P >> S >> G;
	--S; --G;
	vector<vector<int>>g(N);
	REP(i, M) {
		int a, b;
		cin >> a >> b;
		--a; --b;
		g[a].emplace_back(b);
		g[b].emplace_back(a);
	}

	int isBiparititeGraph = 1;
	auto BiparititeGraph = [&](vector<vector<int>>&g){
		vector<int>col(g.size(),-1);
		auto dfs = [&](auto&&f,int now,int par,int bit) -> void{
			col[now] = bit;
			for(auto e:g[now]){
				if(col[e] != -1){
					if(col[e] == (bit ^ 1))continue;
					else{
						isBiparititeGraph = 0;
					}
				}else{
					f(f,e,now,bit ^ 1);
				}
			}
		};
		REP(i,g.size()){
			if(col[i] == -1){
				dfs(dfs,i,-1,0);
			}
		}
		return col;
	};
	auto col = BiparititeGraph(g);
	//out(isBiparititeGraph, col[S], col[G]);
	if((isBiparititeGraph && (P % 2 != (col[G] != col[S])))) {
		out(-1);
		return 0;
	}

	auto f = [&](int start) {
		vector<int>dist(N, INF);
		dist[start] = 0;
		priority_queue<pair<int,int>, vector<pair<int,int>>, greater<pair<int,int>>>que;
		que.push({dist[start], start});
		while(que.size()) {
			auto[cost, now] = que.top();
			que.pop();
			if(dist[now] != cost) continue;
			for(auto e: g[now]) {
				if(CHMIN(dist[e], cost + 1)) {
					que.push({dist[e], e});
				}
			}
		}
		return dist;
	};
	auto ff = [&](int start) {
		using T = tuple<int, int, int>;
		vector<vector<int>>dist(N, vector<int>(2, INF));
		dist[start][0] = 0;
		priority_queue<T, vector<T>, greater<T>>que;
		que.push({dist[start][0], start, 0});
		while(que.size()) {
			auto[cost, now, bit] = que.top();
			que.pop();
			if(dist[now][bit] != cost) continue;
			for(auto e: g[now]) {
				if(CHMIN(dist[e][bit^1], cost + 1)) {
					que.push({dist[e][bit^1], e, bit^1});
				}
			}
		}
		return dist;
	};
	auto distS = ff(S);
	auto distG = ff(G);
	int cost = distS[G][P & 1];
	vector<int>ans;
	REP(i, N) {
		if(min(distS[i][0] + distG[i][0^(P&1)], distS[i][1] + distG[i][1^(P&1)]) <= P) {
			ans.emplace_back(i);
		}
	}
	out(ans.size());
	for(auto &e:ans)cout << e + 1 << endl;
}