#include <bits/stdc++.h>
using namespace std;
const int INF = 0x3f3f3f3f;
const int MAXN = 1e5 + 10;
const int MAXM = 1e5 + 10;
struct Edge {
  int to, next, cap;
  int id;
} edge[MAXM];
int tot, head[MAXN];
inline void init() {
  tot = 0;
  memset(head, -1, sizeof(head));
}
inline void add_edge(int id, int u, int v, int w) {
  edge[tot] = (Edge){v, head[u], w, id};
  head[u] = tot++;
  edge[tot] = (Edge){u, head[v], 0, -1};
  head[v] = tot++;
}
int dep[MAXN];
bool bfs(int s, int t) {
  memset(dep, -1, sizeof(dep));
  dep[s] = 0;
  queue<int> Q;
  Q.push(s);
  while (!Q.empty()) {
    int u = Q.front();
    Q.pop();
    for (int i = head[u]; ~i; i = edge[i].next) {
      int v = edge[i].to;
      if (dep[v] == -1 && edge[i].cap) {
        dep[v] = dep[u] + 1;
        Q.push(v);
      }
    }
  }
  return ~dep[t];
}
int cur[MAXN];
int dinic_dfs(int u, int t, int limit) {
  if (u == t || limit == 0) return limit;
  int f, flow = 0;
  for (int &i = cur[u]; ~i; i = edge[i].next) {
    int v = edge[i].to;
    if (dep[v] == dep[u] + 1 &&
        (f = dinic_dfs(v, t, min(limit, edge[i].cap))) > 0) {
      edge[i].cap -= f;
      edge[i ^ 1].cap += f;
      flow += f;
      if (!(limit -= f)) break;
    }
  }
  return flow;
}
int dinic(int s, int t) {
  int maxflow(0);
  while (bfs(s, t)) {
    memcpy(cur, head, sizeof(head));
    maxflow += dinic_dfs(s, t, INF);
  }
  return maxflow;
}
int n1, n2, m;
int S, T;
int x, y;
int mn;
int deg[MAXN];
vector<int> ans[4020];
int main() {
  scanf("%d%d%d", &n1, &n2, &m);
  S = 0;
  T = n1 + n2 + 1;
  mn = INF;
  for (int i = 0; i <= n1 + n2; i++) deg[i] = 0;
  init();
  for (int i = 1; i <= m; i++) {
    scanf("%d%d", &x, &y);
    add_edge(1, x, n1 + y, 1);
    deg[x]++;
    deg[y + n1]++;
  }
  for (int i = 1; i <= n1 + n2; i++) {
    mn = min(mn, deg[i]);
  }
  for (int i = 1; i <= n1; i++) {
    add_edge(1, S, i, deg[i] - mn);
  }
  for (int i = 1; i <= n2; i++) {
    add_edge(1, i + n1, T, deg[i + n1] - mn);
  }
  for (int i = mn; i >= 0; i--) {
    dinic(S, T);
    for (int j = 0; j < m; j++) {
      if (edge[j << 1].cap == 1) ans[i].push_back(j + 1);
    }
    for (int j = head[S]; ~j; j = edge[j].next) {
      edge[j].cap++;
    }
    for (int j = head[T]; ~j; j = edge[j].next) {
      edge[j ^ 1].cap++;
    }
  }
  for (int i = 0; i <= mn; i++) {
    x = ans[i].size();
    printf("%d", x);
    for (int j = 0; j < x; j++) {
      printf(" %d", ans[i][j]);
    }
    printf("\n");
  }
  return 0;
}
