#include <vector>
#include <string>
#include <iostream>
#include <map>
#include <set>
#include <bit>
#include <algorithm>
#include <queue>
#include <exception>


using namespace std;

struct Edge {
    int a;
    int b;
    int capacity;
    int flow = 0;

    int other(int v) const {
        if (v == a) {
            return b;
        }
        return a;
    }

    int capacityTo(int v) const {
        if (v == a) {
            return flow;
        }
        return capacity - flow;
    }

    void addFlowTo(int v, int delta) {
        if (v == a) {
            flow -= delta;
        } else {
            flow += delta;
        }
    }
};

class Graph {
    vector<Edge> edges;
    vector<vector<int>> graph;
    vector<int> parents;

    void bfs(int start, int finish) {
        queue<int> q;
        q.push(start);
        while (!q.empty() && parents[finish] == -1) {
            const auto vertex = q.front();
            q.pop();
            for (const auto e: graph[vertex]) {
                // 1e9 means unreached
                int to = edges[e].other(vertex);
                if (parents[to] == -1 && edges[e].capacityTo(to)) {
                    parents[to] = e;
                    q.push(to);
                }
            }
        }
    }


    int hasPath(int start, int finish) {
        parents.assign(graph.size(), -1);
        bfs(start, finish);
        if (parents[finish] != -1) {
            int min_capacity = edges[parents[finish]].capacityTo(finish);
            for (int v = finish; v != start; v = edges[parents[v]].other(v)) {
                auto cur_capacity = edges[parents[v]].capacityTo(v);
                if (min_capacity > cur_capacity) {
                    min_capacity = cur_capacity;
                }
            }
            return min_capacity;
        } else {
            return -1;
        }
    }


    void addFlow(int start, int finish, int deltaFlow) {
        for (int v = finish; v != start; v = edges[parents[v]].other(v))
            edges[parents[v]].addFlowTo(v, deltaFlow);
    }

public:

    Graph( vector<Edge> edges, vector<vector<int>> graph) :
            edges(edges), graph(graph) {}


    long long maxFlow(int start, int finish) {
        long long flow = 0;
        int delta = hasPath(start, finish);
        while (delta != -1) {
            addFlow(start, finish, delta);
            flow += delta;
            delta = hasPath(start, finish);
        }
        return flow;
    }

    vector<int> bfs_ans(int start, int finish) {
        parents.assign(graph.size(), -1);
        queue<int> q;
        q.push(start);
        while (!q.empty() && parents[finish] == -1) {
            const auto vertex = q.front();
            q.pop();
            for (const auto e: graph[vertex]) {
                // 1e9 means unreached
                int to = edges[e].other(vertex);
                if (parents[to] == -1  && edges[e].flow > 0) {
                    parents[to] = e;
                    q.push(to);
                }
            }
        }
        vector<int> way;
        int cur = finish;
        way.push_back(finish);
        while (cur != start) {
            edges[parents[cur]].flow = 0;
            cur = edges[parents[cur]].other(cur);
            way.push_back(cur);
        }
        reverse(way.begin(), way.end());
        return way;
    }

};

int main() {
    int n_vertexes, n_edges;
    cin >> n_vertexes >> n_edges;
    int start, finish;
    cin >> start >> finish;
    --start;
    --finish;
    vector<Edge> edges;
    vector<vector<int>> graph(n_vertexes);
    for (size_t i = 0; i < n_edges; ++i) {
        int from, to;
        cin >> from >> to;
        --from;
        --to;
        edges.push_back({from, to, 1});
        graph[from].push_back(edges.size() - 1);
        graph[to].push_back(edges.size() - 1);
    }
    Graph g( edges, graph);
    auto f = g.maxFlow(start, finish);
    if (f < 2) {
        cout << "NO";
    } else {
        cout << "YES" << "\n";
        for (auto el: g.bfs_ans(start, finish)) {
            cout << el+1 << " ";
        }
        cout << "\n";
        for (auto el: g.bfs_ans(start, finish)) {
            cout << el+1 << " ";
        }
        cout << "\n";
    }
}