// UUID: d41603da-7955-4de5-9509-1bb68de6a2c6
#include <bits/stdc++.h>

using namespace std;
using ll = long long;

const int MAXN = 500'001;

vector<pair<int, int>> g[MAXN];
vector<int> bct[MAXN];
vector<pair<int, int>> edges;
vector<int> st;
vector<vector<int>> comps;
bool is_cutpoint[MAXN], is_good[MAXN];
int tin[MAXN], low[MAXN], cid[MAXN], tin2[MAXN], timer = 1, th;
map<int, vector<int>> id_to_nodes;
vector<int> ans;

void dfs(int u, int p = -1) {
    int cnt = 0;
    tin[u] = low[u] = timer++;
    st.emplace_back(u);
    for (auto [v, _] : g[u]) {
        if (v == p) continue;
        if (tin[v]) low[u] = min(low[u], tin[v]);
        else {
            dfs(v, u);
            low[u] = min(low[u], low[v]);

            if (low[v] >= tin[u]) {
                is_cutpoint[u] = (tin[u] > 1 || tin[v] > 2);
                comps.push_back({u});
                while (comps.back().back() != v) {
                    comps.back().push_back(st.back());
                    st.pop_back();
                }
            }
        }
    }
}

void dfs2(int u, int p = -1) {
    tin2[u] = timer++;
    for (int v : bct[u]) {
        if (v != p) {
            dfs2(v, u);
        }
    }
}

void dfs3(int u, int p = -1, bool g = false) {
    if (is_good[u]) g = 1;

    if (g) {
        for (int c : id_to_nodes[u]) {
            if (c != 1) ans.emplace_back(c);
        }
    }

    for (int v : bct[u]) {
        if (v != p) dfs3(v, u, g);
    }
}

void solve() {
    int n, m, k; cin >> n >> m >> k;

    for (int i = 0; i < m; i++) {
        int u, v; cin >> u >> v;
        edges.emplace_back(u, v);
        g[u].emplace_back(v, i);
        g[v].emplace_back(u, i);
    }

    dfs(1);
    int cc = 0;
    for (int i = 1; i <= n; i++) {
        if (is_cutpoint[i]) {
            cid[i] = ++cc;
            id_to_nodes[cc] = {i};
        }
    }

    th = cc;

    for (auto &vec : comps) {
        int id = ++cc;
        sort(vec.begin(), vec.end());
        id_to_nodes[id] = {};
        for (int u : vec) {
            for (auto [v, idx] : g[u]) {
                if (idx < k && binary_search(vec.begin(), vec.end(), v)) {
                    is_good[id] = 1;
                }
            }
            if (is_cutpoint[u]) {
                bct[id].emplace_back(cid[u]);
                bct[cid[u]].emplace_back(id);
            } else {
                id_to_nodes[id].emplace_back(u);
                cid[u] = id;
            }
        }
    }

    dfs2(cid[1]);
    for (int i = 0; i < k; i++) {
        auto [u, v] = edges[i];
        if (tin2[cid[u]] < tin2[cid[v]]) is_good[cid[v]] = 1;
        else is_good[cid[u]] = 1;
    }

    dfs3(cid[1]);
    sort(ans.begin(), ans.end());
    ans.erase(unique(ans.begin(), ans.end()), ans.end());
    cout << ans.size() << "\n";
    for (int u : ans) cout << u << " ";
    cout << "\n";
}

int main() {
    ios::sync_with_stdio(0); cin.tie(0);
    int t = 1; 
    // cin >> t;
    while (t--) solve();
    return 0;
}