package contest170609;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.List;
import java.util.PriorityQueue;
import java.util.Queue;

public class E {
	InputStream is;
	PrintWriter out;
	String INPUT = "";
	
	void solve()
	{
		int n = ni(), m = ni(), Q = ni();
		int[] from = new int[m];
		int[] to = new int[m];
		for(int i = 0;i < m;i++){
			from[i] = ni()-1;
			to[i] = ni()-1;
		}
		int[][] g = packU(n, from, to);
		int[] clus = decomposeToBECC(g);
		int[][] cg = condense(g, clus);
		
		int[][] pars = parents3(cg, 0);
		int[] par = pars[0], ord = pars[1], dep = pars[2];
		
		HeavyLightDecomposition hld = new HeavyLightDecomposition(cg, par, ord, dep);
		
		List<Queue<Integer>> pqs = new ArrayList<>();
		for(int i = 0;i < cg.length;i++)pqs.add(new PriorityQueue<>());
		SegmentTreeRMQPos[] sts = new SegmentTreeRMQPos[hld.cluspath.length];
		for(int i = 0;i < hld.cluspath.length;i++){
			sts[i] = new SegmentTreeRMQPos(hld.cluspath[i].length);
		}
		
		for(int z = 0;z < Q;z++){
			int type = ni();
			if(type == 1){
				int u = clus[ni()-1], w = ni();
				Integer cur = pqs.get(u).peek();
				pqs.get(u).add(-w);
				if(cur == null || -w < cur){
					sts[hld.clus[u]].update(hld.clusiind[u], -w);
				}
			}else{
				int a = clus[ni()-1], b = clus[ni()-1];
				int lca = hld.lca(a, b);
				
				int tempmin = 1;
				int argmin = -1;
				{
					int x = a;
					int cx = hld.clus[x]; // cluster
					int ind = hld.clusiind[x]; // pos in cluster
					while(cx != hld.clus[lca]){
						int minval = sts[cx].minx(0, ind+1);
						if(minval < tempmin){
							tempmin = minval;
							argmin = hld.cluspath[cx][sts[cx].minpos];
						}
						int con = par[hld.cluspath[cx][0]];
						ind = hld.clusiind[con];
						cx = hld.clus[con];
					}
					int minval = sts[cx].minx(hld.clusiind[lca], ind+1);
					if(minval < tempmin){
						tempmin = minval;
						argmin = hld.cluspath[cx][sts[cx].minpos];
					}
				}
				{
					int x = b;
					int cx = hld.clus[x]; // cluster
					int ind = hld.clusiind[x]; // pos in cluster
					while(cx != hld.clus[lca]){
						int minval = sts[cx].minx(0, ind+1);
						if(minval < tempmin){
							tempmin = minval;
							argmin = hld.cluspath[cx][sts[cx].minpos];
						}
						int con = par[hld.cluspath[cx][0]];
						ind = hld.clusiind[con];
						cx = hld.clus[con];
					}
					int minval = sts[cx].minx(hld.clusiind[lca], ind+1);
					if(minval < tempmin){
						tempmin = minval;
						argmin = hld.cluspath[cx][sts[cx].minpos];
					}
				}
				out.println(argmin == -1 ? -1 : -tempmin);
				if(argmin != -1){
					pqs.get(argmin).poll();
					Integer cur = pqs.get(argmin).peek();
					if(cur == null){
						sts[hld.clus[argmin]].update(hld.clusiind[argmin], Integer.MAX_VALUE);
					}else{
						sts[hld.clus[argmin]].update(hld.clusiind[argmin], cur);
					}
				}
			}
		}
	}
	
	public static class SegmentTreeRMQPos {
		public int M, H, N;
		public int[] st;
		public int[] pos;
		
		public SegmentTreeRMQPos(int n)
		{
			N = n;
			M = Integer.highestOneBit(Math.max(N-1, 1))<<2;
			H = M>>>1;
			st = new int[M];
			pos = new int[M];
			for(int i = 0;i < N;i++)pos[H+i] = i;
			Arrays.fill(st, 0, M, Integer.MAX_VALUE);
			for(int i = H-1;i >= 1;i--)propagate(i);
		}
		
		public SegmentTreeRMQPos(int[] a)
		{
			N = a.length;
			M = Integer.highestOneBit(Math.max(N-1, 1))<<2;
			H = M>>>1;
			st = new int[M];
			pos = new int[M];
			for(int i = 0;i < N;i++){
				st[H+i] = a[i];
				pos[H+i] = i;
			}
			Arrays.fill(st, H+N, M, Integer.MAX_VALUE);
			for(int i = H-1;i >= 1;i--)propagate(i);
		}
		
		public void update(int pos, int x)
		{
			st[H+pos] = x;
			for(int i = (H+pos)>>>1;i >= 1;i >>>= 1)propagate(i);
		}
		
		private void propagate(int i)
		{
			if(st[2*i] <= st[2*i+1]){
				st[i] = st[2*i];
				pos[i] = pos[2*i];
			}else{
				st[i] = st[2*i+1];
				pos[i] = pos[2*i+1];
			}
		}
		
		public int minpos;
		public int minval;
		
		public int minx(int l, int r){
			minval = Integer.MAX_VALUE;
			minpos = -1;
			if(l >= r)return minval;
			while(l != 0){
				int f = l&-l;
				if(l+f > r)break;
				int v = st[(H+l)/f];
				if(v < minval){
					minval = v;
					minpos = pos[(H+l)/f];
				}
				l += f;
			}
			
			while(l < r){
				int f = r&-r;
				int v = st[(H+r)/f-1];
				if(v < minval){
					minval = v;
					minpos = pos[(H+r)/f-1];
				}
				r -= f;
			}
			return minval;
		}
		
		public int min(int l, int r){ 
			minpos = -1;
			minval = Integer.MAX_VALUE;
			min(l, r, 0, H, 1);
			return minval;
		}
		
		private void min(int l, int r, int cl, int cr, int cur)
		{
			if(l <= cl && cr <= r){
				if(st[cur] < minval){
					minval = st[cur];
					minpos = pos[cur];
				}
			}else{
				int mid = cl+cr>>>1;
				if(cl < r && l < mid)min(l, r, cl, mid, 2*cur);
				if(mid < r && l < cr)min(l, r, mid, cr, 2*cur+1);
			}
		}
	}

	
	public static class HeavyLightDecomposition {
		public int[] clus;
		public int[][] cluspath;
		public int[] clusiind;
		public int[] par, dep;
		
		public HeavyLightDecomposition(int[][] g, int[] par, int[] ord, int[] dep)
		{
			init(g, par, ord, dep);
		}
		
		public void init(int[][] g, int[] par, int[] ord, int[] dep)
		{
			clus = decomposeToHeavyLight(g, par, ord);
			cluspath = clusPaths(clus, ord);
			clusiind = clusIInd(cluspath, g.length);
			this.par = par;
			this.dep = dep;
		}
		
		public static int[] decomposeToHeavyLight(int[][] g, int[] par, int[] ord)
		{
			int n = g.length;
			int[] size = new int[n];
			Arrays.fill(size, 1);
			for(int i = n-1;i > 0;i--)size[par[ord[i]]] += size[ord[i]];
			
			int[] clus = new int[n];
			Arrays.fill(clus, -1);
			int p = 0;
			for(int i = 0;i < n;i++){
				int u = ord[i];
				if(clus[u] == -1)clus[u] = p++;
				// centroid path (not heavy path)
				int argmax = -1;
				for(int v : g[u]){
					if(par[u] != v && (argmax == -1 || size[v] > size[argmax]))argmax = v;
				}
				if(argmax != -1)clus[argmax] = clus[u];
			}
			return clus;
		}
		
		public static int[][] clusPaths(int[] clus, int[] ord)
		{
			int n = clus.length;
			int[] rp = new int[n];
			int sup = 0;
			for(int i = 0;i < n;i++){
				rp[clus[i]]++;
				sup = Math.max(sup, clus[i]);
			}
			sup++;
			
			int[][] row = new int[sup][];
			for(int i = 0;i < sup;i++)row[i] = new int[rp[i]];
			
			for(int i = n-1;i >= 0;i--){
				row[clus[ord[i]]][--rp[clus[ord[i]]]] = ord[i];
			}
			return row;
		}
		
		public static int[] clusIInd(int[][] clusPath, int n)
		{
			int[] iind = new int[n];
			for(int[] path : clusPath){
				for(int i = 0;i < path.length;i++){
					iind[path[i]] = i;
				}
			}
			return iind;
		}
		
		public int lca(int x, int y)
		{
			int rx = cluspath[clus[x]][0];
			int ry = cluspath[clus[y]][0];
			while(clus[x] != clus[y]){
				if(dep[rx] > dep[ry]){
					x = par[rx];
					rx = cluspath[clus[x]][0];
				}else{
					y = par[ry];
					ry = cluspath[clus[y]][0];
				}
			}
			return clusiind[x] > clusiind[y] ? y : x;
		}
		
		public int ancestor(int x, int v)
		{
			while(x != -1){
				if(v <= clusiind[x])return cluspath[clus[x]][clusiind[x]-v];
				v -= clusiind[x]+1;
				x = par[cluspath[clus[x]][0]];
			}
			return x;
		}
		
		///// templates
		
		/**
		 * xとその先祖ancについて経路x-ancでのクエリを処理するテンプレ
		 * @param x
		 * @param anc
		 */
		public void query(int x, int anc)
		{
			int cx = clus[x]; // cluster
			int ind = clusiind[x]; // pos in cluster
			while(cx != clus[anc]){
				// TODO クラスタcxの0~indについて逆向きにクエリ処理
				// st[cx].add(0, ind+1, v);
				int con = par[cluspath[cx][0]];
				ind = clusiind[con];
				cx = clus[con];
			}
			// TODO clusiind[anc]~indについて逆向きにクエリ処理
			// st[cx].add(clusiind[anc], ind+1, v);
		}

	}

	
	public static int lca2(int a, int b, int[][] spar, int[] depth) {
		if (depth[a] < depth[b]) {
			b = ancestor(b, depth[b] - depth[a], spar);
		} else if (depth[a] > depth[b]) {
			a = ancestor(a, depth[a] - depth[b], spar);
		}

		if (a == b)
			return a;
		int sa = a, sb = b;
		for (int low = 0, high = depth[a], t = Integer.highestOneBit(high), k = Integer
				.numberOfTrailingZeros(t); t > 0; t >>>= 1, k--) {
			if ((low ^ high) >= t) {
				if (spar[k][sa] != spar[k][sb]) {
					low |= t;
					sa = spar[k][sa];
					sb = spar[k][sb];
				} else {
					high = low | t - 1;
				}
			}
		}
		return spar[0][sa];
	}

	protected static int ancestor(int a, int m, int[][] spar) {
		for (int i = 0; m > 0 && a != -1; m >>>= 1, i++) {
			if ((m & 1) == 1)
				a = spar[i][a];
		}
		return a;
	}

	public static int[][] logstepParents(int[] par) {
		int n = par.length;
		int m = Integer.numberOfTrailingZeros(Integer.highestOneBit(n - 1)) + 1;
		int[][] pars = new int[m][n];
		pars[0] = par;
		for (int j = 1; j < m; j++) {
			for (int i = 0; i < n; i++) {
				pars[j][i] = pars[j - 1][i] == -1 ? -1 : pars[j - 1][pars[j - 1][i]];
			}
		}
		return pars;
	}

	
	public static int[][] parents3(int[][] g, int root) {
		int n = g.length;
		int[] par = new int[n];
		Arrays.fill(par, -1);

		int[] depth = new int[n];
		depth[0] = 0;

		int[] q = new int[n];
		q[0] = root;
		for (int p = 0, r = 1; p < r; p++) {
			int cur = q[p];
			for (int nex : g[cur]) {
				if (par[cur] != nex) {
					q[r++] = nex;
					par[nex] = cur;
					depth[nex] = depth[cur] + 1;
				}
			}
		}
		return new int[][] { par, q, depth };
	}

	
	public static int[][] condense(int[][] g, int[] clus)
	{
		int n = g.length;
		int m = 0;
		for(int i = 0;i < n;i++)m = Math.max(m, clus[i]);
		m++;
		
		int[] cp = new int[m];
		for(int i = 0;i < n;i++){
			cp[clus[i]] += g[i].length;
		}
		int[][] c = new int[m][];
		for(int i = 0;i < m;i++){
			c[i] = new int[cp[i]];
		}
		
		for(int i = 0;i < n;i++){
			for(int j = 0;j < g[i].length;j++){
				c[clus[i]][--cp[clus[i]]] = clus[g[i][j]];
			}
		}
		
		for(int i = 0;i < m;i++){
			Arrays.sort(c[i]);
			int jp = 0;
			for(int j = 0;j < c[i].length;j++){
				if((j == 0 || c[i][j] != c[i][j-1]) && c[i][j] != i){
					c[i][jp++] = c[i][j];
				}
			}
			c[i] = Arrays.copyOf(c[i], jp);
		}
		return c;
	}
	
	public static int[] decomposeToBECC(int[][] g)
	{
		int n = g.length;
		boolean[] visited = new boolean[n];
		int[] ord = new int[n];
		int[] low = new int[n];
		
		int[] ids = new int[n];
		int[] inds = new int[n];
		int[] parct = new int[n];
		int pos = 0;
		for(int i = 0;i < n;i++){
			if(!visited[i]){
				ids[0] = i;
				inds[0] = 0;
				int sp = 1;
				while(sp > 0){
					int cur = ids[sp-1];
					if(inds[sp-1] == 0){
						visited[cur] = true;
						ord[cur] = low[cur] = pos++;
						parct[sp-1] = 0;
					}
					if(inds[sp-1] == g[cur].length){
						if(sp-2 >= 0)low[ids[sp-2]] = Math.min(low[ids[sp-2]], low[cur]);
						sp--;
						continue;
					}
					int next = g[cur][inds[sp-1]];
					if(!visited[next]){
						ids[sp] = next;
						inds[sp] = 0;
						inds[sp-1]++;
						sp++;
						continue;
					}else if(sp-2 >= 0 && (next != ids[sp-2] || ++parct[sp-1] >= 2)){
						low[cur] = Math.min(low[cur], ord[next]);
					}
					inds[sp-1]++;
				}
			}
		}
		
		int[] clus = new int[n];
		Arrays.fill(clus, -1);
		int[] q = new int[n];
		int cnum = 0;
		for(int i = 0;i < n;i++){
			if(clus[i] == -1){
				int p = 0;
				q[p++] = i;
				clus[i] = cnum++;
				for(int r = 0;r < p;r++){
					int cur = q[r];
					for(int next : g[cur]){
						if(clus[next] == -1){
							clus[next] = ord[cur] < low[next] ? cnum++ : clus[cur];
							q[p++] = next;
						}
					}
				}
			}
		}
		return clus;
	}

	
	static int[][] packU(int n, int[] from, int[] to) {
		int[][] g = new int[n][];
		int[] p = new int[n];
		for (int f : from)
			p[f]++;
		for (int t : to)
			p[t]++;
		for (int i = 0; i < n; i++)
			g[i] = new int[p[i]];
		for (int i = 0; i < from.length; i++) {
			g[from[i]][--p[from[i]]] = to[i];
			g[to[i]][--p[to[i]]] = from[i];
		}
		return g;
	}
	
	void run() throws Exception
	{
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);
		
		long s = System.currentTimeMillis();
		solve();
		out.flush();
		if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//		Thread t = new Thread(null, null, "~", Runtime.getRuntime().maxMemory()){
//			@Override
//			public void run() {
//				long s = System.currentTimeMillis();
//				solve();
//				out.flush();
//				if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//			}
//		};
//		t.start();
//		t.join();
	}
	
	public static void main(String[] args) throws Exception { new E().run(); }
	
	private byte[] inbuf = new byte[1024];
	public int lenbuf = 0, ptrbuf = 0;
	
	private int readByte()
	{
		if(lenbuf == -1)throw new InputMismatchException();
		if(ptrbuf >= lenbuf){
			ptrbuf = 0;
			try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
			if(lenbuf <= 0)return -1;
		}
		return inbuf[ptrbuf++];
	}
	
	private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
	private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
	
	private double nd() { return Double.parseDouble(ns()); }
	private char nc() { return (char)skip(); }
	
	private String ns()
	{
		int b = skip();
		StringBuilder sb = new StringBuilder();
		while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ')
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	
	private char[] ns(int n)
	{
		char[] buf = new char[n];
		int b = skip(), p = 0;
		while(p < n && !(isSpaceChar(b))){
			buf[p++] = (char)b;
			b = readByte();
		}
		return n == p ? buf : Arrays.copyOf(buf, p);
	}
	
	private int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private long[] nal(int n)
	{
		long[] a = new long[n];
		for(int i = 0;i < n;i++)a[i] = nl();
		return a;
	}
	
	private char[][] nm(int n, int m) {
		char[][] map = new char[n][];
		for(int i = 0;i < n;i++)map[i] = ns(m);
		return map;
	}
	
	private int[][] nmi(int n, int m) {
		int[][] map = new int[n][];
		for(int i = 0;i < n;i++)map[i] = na(m);
		return map;
	}
	
	private int ni() { return (int)nl(); }
	
	private long nl()
	{
		long num = 0;
		int b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
}