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#include <bits/stdc++.h>
struct DSU {
  std::vector<int> s;
  DSU(const int& _n) { s.assign(_n, -1); }
  int find(const int& i) { return s[i] < 0 ? i : (s[i] = find(s[i])); }
  bool join(int a, int b) {
    if ((a = find(a)) == (b = find(b))) return false;
    if (s[a] == s[b]) s[a]--;
    if (s[a] <= s[b])
      s[b] = a;
    else
      s[a] = b;
    return true;
  }
};
const static int INF = 0x3f3f3f3f;
static inline void setio(void);
const int MAX_N = 300001;
int dia[MAX_N], dist[MAX_N];
std::vector<int> gr[MAX_N];
std::vector<int> comps[MAX_N];
DSU sets(MAX_N);
void get_dia(const int& start) {
  for (const auto& node : comps[start]) dist[node] = INF;
  dist[start] = 0;
  std::queue<int> order;
  order.push(start);
  while (!order.empty()) {
    int cur = order.front();
    order.pop();
    for (const auto& nei : gr[cur]) {
      if (dist[nei] > 1 + dist[cur]) {
        dist[nei] = 1 + dist[cur];
        order.push(nei);
      }
    }
  }
  int max = start, md = dist[start];
  for (const auto& node : comps[start]) {
    if (dist[node] > md) {
      max = node;
      md = dist[node];
    }
    dist[node] = INF;
  }
  dist[max] = 0;
  order.push(max);
  while (!order.empty()) {
    int cur = order.front();
    order.pop();
    for (const auto& nei : gr[cur]) {
      if (dist[nei] > 1 + dist[cur]) {
        dist[nei] = 1 + dist[cur];
        order.push(nei);
      }
    }
  }
  md = 0;
  for (const auto& node : comps[start]) {
    md = std::max(md, dist[node]);
  }
  dia[start] = md;
}
void merge(const int& a, const int& b) {
  int ahead = sets.find(a), bhead = sets.find(b);
  if (!sets.join(ahead, bhead)) return;
  int newhead = sets.find(a);
  if (newhead != ahead) {
    comps[newhead].insert(comps[newhead].end(), comps[ahead].begin(),
                          comps[ahead].end());
    comps[ahead].clear();
  }
  if (newhead != bhead) {
    comps[newhead].insert(comps[newhead].end(), comps[bhead].begin(),
                          comps[bhead].end());
    comps[bhead].clear();
  }
  dia[newhead] =
      std::max(dia[newhead], 1 + (1 + dia[ahead]) / 2 + (1 + dia[bhead]) / 2);
}
int main(void) {
  setio();
  int n, m, q;
  std::cin >> n >> m >> q;
  for (int i = 0; i < n; ++i) {
    comps[i].push_back(i);
    dia[i] = 0;
  }
  for (int i = 0, a, b; i < m; ++i) {
    std::cin >> a >> b;
    --a;
    --b;
    gr[a].push_back(b);
    gr[b].push_back(a);
    merge(a, b);
  }
  for (int i = 0; i < n; ++i) {
    if (sets.find(i) == i) get_dia(i);
  }
  for (int type, x, y; q--;) {
    std::cin >> type >> x;
    if (type == 1) {
      std::cout << dia[sets.find(x - 1)] << "\n";
    } else {
      std::cin >> y;
      --x;
      --y;
      merge(x, y);
    }
  }
  std::cerr << static_cast<double>(clock()) / CLOCKS_PER_SEC << "\n";
  return 0;
}
static inline void setio(void) {
  std::ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  std::cout.precision(10);
  std::cout << std::fixed;
}
