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#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using vi = vector<int>;
const int N = 3e5 + 11, mod = 1e9 + 7, mod2 = 998244353;
const int MAX = 1e5 + 11;
const int INF1 = 2e9 + 11;
const ll INF2 = 2e18 + 11;
const double INF3 = 1e8 + 11;
const int base = 500;
const int P = 31;
const int dx[] = {1, -1, 0, 0, 1, 1, -1, -1};
const int dy[] = {0, 0, 1, -1, 1, -1, 1, -1};
const double EPS = 1e-4;
const double PI = acos(-1.0);
template <typename T1, typename T2>
inline void chmin(T1 &a, T2 b) {
  if (a > b) a = b;
}
template <typename T1, typename T2>
inline void chmax(T1 &a, T2 b) {
  if (a < b) a = b;
}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int n, m, q, pr[N], sz[N], r;
vi g[N];
int f(int x) { return (pr[x] == x ? x : pr[x] = f(pr[x])); }
int main() {
  if (fopen("threesum"
            ".in",
            "r"))
    freopen(
        "threesum"
        ".in",
        "r", stdin),
        freopen(
            "threesum"
            ".out",
            "w", stdout);
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  cin >> n >> m >> q;
  for (int i = 1; i <= n; i += 1) pr[i] = i;
  for (int i = 1; i <= m; i += 1) {
    int u, v;
    cin >> u >> v;
    r = u;
    g[u].emplace_back(v);
    g[v].emplace_back(u);
    u = f(u);
    v = f(v);
    if (u != v) pr[u] = v;
  }
  int mx = 0;
  function<void(int, int, int)> dfs1 = [&](int v, int pr, int d) {
    if (d > mx) {
      mx = d;
      r = v;
    }
    for (int to : g[v]) {
      if (to != pr) {
        dfs1(to, v, d + 1);
      }
    }
  };
  dfs1(r, r, 0);
  mx = 0;
  dfs1(r, r, 0);
  r = f(r);
  sz[r] = mx;
  while (q--) {
    int type, x, y;
    cin >> type >> x;
    if (type == 1)
      cout << sz[f(x)] << "\n";
    else {
      cin >> y;
      x = f(x);
      y = f(y);
      if (x == y) continue;
      int a = sz[x], b = sz[y];
      sz[x] = (sz[x] + 1) / 2 + (sz[y] + 1) / 2 + 1;
      chmax(sz[x], max(a, b));
      pr[y] = x;
    }
  }
  return 0;
}
