10 3 5
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2 3
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1 6
2 1 6
2 8 7
1 10
 10 2 6
1 2
1 3
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2 9 2
1 2
1 9
2 3 5
1 8
 10 5 2
1 2
1 3
1 4
2 5
1 6
1 5
1 8
 10 6 64
1 2
2 3
2 4
4 5
3 6
3 7
2 4 4
1 4
1 6
1 5
1 8
2 1 10
2 6 8
2 4 2
1 10
1 6
2 4 3
2 5 9
1 4
2 8 7
2 3 6
2 8 5
2 7 3
2 10 7
2 9 3
1 8
2 7 5
2 6 10
2 5 9
1 10
2 8 9
1 2
2 9 10
2 5 1
2 10 1
2 3 9
2 10 2
2 5 4
1 1
1 5
2 7 5
1 7
2 9 5
2 8 2
1 3
1 10
2 8 8
2 8 2
2 9 8
2 7 10
1 1
1 6
2 1 6
1 2
1 10
2 6 4
1 3
2 6 6
2 10 3
2 3 5
1 2
2 1 7
2 4 4
1 9
1 10
1 5
2 8 3
1 6
1 4
1 8
 10 9 16
1 2
1 3
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2 5
4 6
4 7
6 8
4 9
5 10
2 1 5
2 4 4
1 7
1 8
1 6
1 4
1 10
1 4
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2 8 10
2 5 5
2 7 3
2 8 7
2 7 7
2 7 3
2 4 6
 10 5 42
1 2
1 3
2 4
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1 6
1 4
2 9 2
2 10 5
1 4
2 2 7
2 10 5
2 6 10
1 4
1 4
1 2
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1 7
2 4 4
2 10 6
2 9 3
1 9
1 2
2 8 1
1 8
2 3 5
1 8
2 5 5
2 2 7
2 8 5
1 9
1 1
2 4 4
2 6 6
2 1 7
1 6
2 8 3
2 7 4
1 8
2 3 6
2 8 6
2 3 6
2 9 3
1 3
1 9
2 3 7
1 2
1 7
 100 22 4
100 24
100 27
100 4
100 60
24 63
63 17
27 89
17 71
63 77
77 43
63 9
100 65
24 14
27 15
60 10
71 16
100 67
10 1
1 40
10 83
43 66
67 18
1 6
1 27
1 6
1 49
 10 7 48
1 2
2 3
2 4
3 5
4 6
6 7
7 8
2 7 4
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1 2
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2 2 9
1 10
2 6 7
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2 2 6
1 7
2 1 2
1 3
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2 5 6
2 7 1
2 4 2
2 1 9
2 6 9
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1 1
1 2
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1 4
2 2 2
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2 5 5
2 5 7
1 5
2 8 7
1 9
2 10 9
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2 6 6
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2 3 3
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 10 4 4
1 2
1 3
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1 5
1 2
1 3
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1 2
1 3
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4 6
5 7
3 8
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1 9
1 8
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1 3
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1 6
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1 8
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1 9
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 10 1 14
1 2
1 1
1 8
1 9
2 2 5
1 9
1 6
2 10 9
2 4 8
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2 2 4
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2 8 10
2 7 4
 100 10 30
58 81
58 7
58 74
74 97
81 56
81 15
15 49
97 45
97 47
58 34
2 52 44
2 55 79
2 52 5
1 48
2 60 35
2 37 82
2 77 52
2 9 23
2 25 61
2 63 34
1 81
2 47 20
1 79
2 34 19
1 70
1 36
2 27 85
2 52 89
1 25
2 46 46
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1 33
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2 29 56
2 3 73
2 37 46
2 29 83
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 10 8 43
1 2
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2 3
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1 6
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2 8 10
1 10
2 9 5
1 7
1 4
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 100 16 46
36 42
36 50
42 54
42 74
50 58
42 16
50 81
50 96
42 62
54 2
74 75
74 22
2 48
50 95
74 66
75 5
1 62
1 56
2 6 68
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1 43
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1 75
2 22 82
2 56 77
1 71
2 52 15
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2 12 59
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2 41 94
2 18 58
2 22 67
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2 68 70
1 81
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2 31 73
2 58 80
2 100 57
2 88 79
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2 96 23
2 92 44
1 12
1 66
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2 71 68
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2 84 43
2 80 15
2 54 13
1 51
2 99 17
1 63
2 12 41
2 1 2
2 62 96
2 79 9
2 59 79
 10 1 9
1 2
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1 2
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2 2 3
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1 8
1 3
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2 2 2
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1 3
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1 9
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 10 7 26
1 2
2 3
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4 6
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1 3
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2 9 4
2 5 1
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2 1 4
1 6
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1 3
1 1
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2 2 5
1 1
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2 5 1
2 1 8
 10 6 21
1 2
2 3
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1 1
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1 1
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1 3
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1 7

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import java.io.*;
import java.util.*;

import static java.lang.Math.*;
import static java.util.Arrays.*;

public class cf455c_2 {
    static BufferedReader __in;
    static PrintWriter __out;
    static StringTokenizer input;

    public static void main(String[] args) throws IOException {
        __in = new BufferedReader(new InputStreamReader(System.in));
        __out = new PrintWriter(new OutputStreamWriter(System.out));

        int n = rni(), m = ni(), q = ni();
        Node[] g = new Node[n];
        DSU dsu = new DSU(n);
        for(int i = 0; i < n; ++i) {
            g[i] = new Node(i);
        }
        for(int i = 0; i < m; ++i) {
            int a = rni() - 1, b = ni() - 1;
            g[a].nei.add(g[b]);
            g[b].nei.add(g[a]);
            dsu.join(a, b);
        }
        for(int i = 0; i < n; ++i) {
            if(dsu.dia[dsu.find(i)] == -1) {
                dsu.dia[dsu.find(i)] = g[i].dia(null).a;
            }
        }
        /*for(int i = 0; i < n; ++i) {
            prln(i, dsu.dia[dsu.find(i)]);
        }*/
        while(q --> 0) {
            int t = rni();
            if(t == 1) {
                prln(dsu.dia[dsu.find(ni() - 1)]);
            } else {
                dsu.union(ni() - 1, ni() - 1);
            }
        }

        close();
    }

    static class Node {
        List<Node> nei = new ArrayList<>();
        int i;

        Node(int i_) {
            i = i_;
        }

        P dia(Node par) {
            if(par == null && nei.size() == 0 || nei.size() == 1) {
                return new P(0, 0);
            } else {
                PriorityQueue<Integer> lens = new PriorityQueue<>((a, b) -> b - a);
                int left = 0, right = 0, ans = 0;
                for(Node n : nei) {
                    if(n != par) {
                        P p = n.dia(this);
                        lens.offer(p.b);
                        ans = max(ans, p.a);
                    }
                }
                left = lens.poll();
                if(!lens.isEmpty()) {
                    right = lens.poll();
                }
                P p = new P(max(ans, left + right + min(nei.size() - (par == null ? 0 : 1), 2)), left + 1);
                /*pr(i);
                pr(' ');
                prln(p);*/
                return p;
            }
        }
    }

    static class DSU {
        int[] par, sz, dia;

        DSU(int n) {
            par = new int[n];
            sz = new int[n];
            dia = new int[n];
            fill(dia, -1);
            for(int i = 0; i < n; ++i) {
                make(i);
            }
        }

        void make(int v) {
            par[v] = v;
            sz[v] = 1;
        }

        int find(int v) {
            if(v == par[v]) {
                return v;
            } else {
                par[v] = find(par[v]);
                return par[v];
            }
        }

        void join(int u, int v) {
            int a = find(u), b = find(v);
            if(a != b) {
                if(sz[a] < sz[b]) {
                    int swap = a;
                    a = b;
                    b = swap;
                }
                par[b] = a;
                sz[a] += sz[b];
            }
        }

        void union(int u, int v) {
            int a = find(u), b = find(v);
            if(a != b) {
                if(sz[a] < sz[b]) {
                    int swap = a;
                    a = b;
                    b = swap;
                }
                par[b] = a;
                sz[a] += sz[b];
                dia[a] = maxof(dia[a], dia[b], (dia[b] + 1) / 2 + (dia[a] + 1) / 2 + 1);
            }
        }
    }

    static class P {
        int a, b;

        P(int a_, int b_) {
            a = a_;
            b = b_;
        }

        @Override
        public String toString() {
            return "Pair{" + "a = " + a + ", b = " + b + '}';
        }

        public boolean equalsSafe(Object o) {
            if(this == o) return true;
            if(o == null || getClass() != o.getClass()) return false;
            P p = (P)o;
            return a == p.a && b == p.b;
        }

        public boolean equalsUnchecked(Object o) {
            P p = (P)o;
            return a == p.a && b == p.b;
        }

        @Override
        public boolean equals(Object o) {
            return equalsUnchecked(o);
        }

        @Override
        public int hashCode() {
            return Objects.hash(a, b);
        }
    }

    // references
    // IBIG = 1e9 + 7
    // IRAND ~= 3e8
    // IMAX ~= 2e10
    // LMAX ~= 9e18
    // constants
    static final int IBIG = 1000000007;
    static final int IRAND = 327859546;
    static final int IMAX = 2147483647;
    static final int IMIN = -2147483648;
    static final long LMAX = 9223372036854775807L;
    static final long LMIN = -9223372036854775808L;
    // util
    static int minof(int a, int b, int c) {return min(a, min(b, c));}
    static int minof(int... x) {return x.length == 1 ? x[0] : x.length == 2 ? min(x[0], x[1]) : min(x[0], minstarting(1, x));}
    static int minstarting(int offset, int... x) {assert x.length > 2; return offset == x.length - 2 ? min(x[offset], x[offset + 1]) : min(x[offset], minstarting(offset + 1, x));}
    static long minof(long a, long b, long c) {return min(a, min(b, c));}
    static long minof(long... x) {return x.length == 1 ? x[0] : x.length == 2 ? min(x[0], x[1]) : min(x[0], minstarting(1, x));}
    static long minstarting(int offset, long... x) {assert x.length > 2; return offset == x.length - 2 ? min(x[offset], x[offset + 1]) : min(x[offset], minstarting(offset + 1, x));}
    static int maxof(int a, int b, int c) {return max(a, max(b, c));}
    static int maxof(int... x) {return x.length == 1 ? x[0] : x.length == 2 ? max(x[0], x[1]) : max(x[0], maxstarting(1, x));}
    static int maxstarting(int offset, int... x) {assert x.length > 2; return offset == x.length - 2 ? max(x[offset], x[offset + 1]) : max(x[offset], maxstarting(offset + 1, x));}
    static long maxof(long a, long b, long c) {return max(a, max(b, c));}
    static long maxof(long... x) {return x.length == 1 ? x[0] : x.length == 2 ? max(x[0], x[1]) : max(x[0], maxstarting(1, x));}
    static long maxstarting(int offset, long... x) {assert x.length > 2; return offset == x.length - 2 ? max(x[offset], x[offset + 1]) : max(x[offset], maxstarting(offset + 1, x));}
    static int powi(int a, int b) {if(a == 0) return 0; int ans = 1; while(b > 0) {if((b & 1) > 0) ans *= a; a *= a; b >>= 1;} return ans;}
    static long powl(long a, int b) {if(a == 0) return 0; long ans = 1; while(b > 0) {if((b & 1) > 0) ans *= a; a *= a; b >>= 1;} return ans;}
    static int floori(double d) {return (int)d;}
    static int ceili(double d) {return (int)ceil(d);}
    static long floorl(double d) {return (long)d;}
    static long ceill(double d) {return (long)ceil(d);}
    // input
    static void r() throws IOException {input = new StringTokenizer(__in.readLine());}
    static int ri() throws IOException {return Integer.parseInt(__in.readLine());}
    static long rl() throws IOException {return Long.parseLong(__in.readLine());}
    static int[] ria(int n) throws IOException {int[] a = new int[n]; input = new StringTokenizer(__in.readLine()); for(int i = 0; i < n; ++i) a[i] = Integer.parseInt(input.nextToken()); return a;}
    static long[] rla(int n) throws IOException {long[] a = new long[n]; input = new StringTokenizer(__in.readLine()); for(int i = 0; i < n; ++i) a[i] = Long.parseLong(input.nextToken()); return a;}
    static char[] rcha() throws IOException {return __in.readLine().toCharArray();}
    static String rline() throws IOException {return __in.readLine();}
    static int rni() throws IOException {input = new StringTokenizer(__in.readLine()); return Integer.parseInt(input.nextToken());}
    static int ni() {return Integer.parseInt(input.nextToken());}
    static long rnl() throws IOException {input = new StringTokenizer(__in.readLine()); return Long.parseLong(input.nextToken());}
    static long nl() {return Long.parseLong(input.nextToken());}
    // output
    static void pr(int i) {__out.print(i);}
    static void prln(int i) {__out.println(i);}
    static void pr(long l) {__out.print(l);}
    static void prln(long l) {__out.println(l);}
    static void pr(double d) {__out.print(d);}
    static void prln(double d) {__out.println(d);}
    static void pr(char c) {__out.print(c);}
    static void prln(char c) {__out.println(c);}
    static void pr(char[] s) {__out.print(new String(s));}
    static void prln(char[] s) {__out.println(new String(s));}
    static void pr(String s) {__out.print(s);}
    static void prln(String s) {__out.println(s);}
    static void pr(Object o) {__out.print(o);}
    static void prln(Object o) {__out.println(o);}
    static void prln() {__out.println();}
    static void pryes() {__out.println("yes");}
    static void pry() {__out.println("Yes");}
    static void prY() {__out.println("YES");}
    static void prno() {__out.println("no");}
    static void prn() {__out.println("No");}
    static void prN() {__out.println("NO");}
    static void pryesno(boolean b) {__out.println(b ? "yes" : "no");};
    static void pryn(boolean b) {__out.println(b ? "Yes" : "No");}
    static void prYN(boolean b) {__out.println(b ? "YES" : "NO");}
    static void prln(int... a) {for(int i = 0, len = a.length - 1; i < len; __out.print(a[i]), __out.print(' '), ++i); __out.println(a[a.length - 1]);}
    static void prln(long... a) {for(int i = 0, len = a.length - 1; i < len; __out.print(a[i]), __out.print(' '), ++i); __out.println(a[a.length - 1]);}
    static <T> void prln(Collection<T> c) {int n = c.size() - 1; Iterator<T> iter = c.iterator(); for(int i = 0; i < n; __out.print(iter.next()), __out.print(' '), ++i); __out.println(iter.next());}
    static void flush() {__out.flush();}
    static void close() {__out.close();}
}