package No400番台;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Comparator;
import java.util.InputMismatchException;

public class Q416_2 {
	static InputStream is;
	static PrintWriter out;
	static String INPUT = "";

	void solver() {
		int N = ni(), M = ni(), Q = ni();
		long[] list = new long[M];
		long[][] nt = new long[M][2];
		for (int i = 0; i < M; i++) {
			list[i] = ((long) (ni() - 1) << 32) | (ni() - 1);
		}
		Arrays.sort(list);
		for (int i = 0; i < M; i++) {
			nt[i][0] = list[i];
			nt[i][1] = Q + 1;
		}
		for (int i = 0; i < Q; i++) {
			int idx = Arrays.binarySearch(list, ((long) (ni() - 1) << 32) | (ni() - 1));
			nt[idx][1] = i + 1;
		}
		Arrays.sort(nt, new Comparator<long[]>() {
			@Override
			public int compare(long[] o1, long[] o2) {
				return -Long.compare(o1[1], o2[1]);
			}
		});
		int[] ret = new int[N];
		Arrays.fill(ret, 0);
		DJSet ds = new DJSet(N);
		for (int i = 0; i < M; i++) {
			long idx = nt[i][0];
			int x = (int) (idx >> 32), y = (int) (idx);
			if (ds.equiv(x, y)) {
				continue;
			} else if (ds.equiv(x, 0)) {
				for (int r = ds.root(y); -1 != r; r = ds.next[r]) {
					ret[r] = (int) nt[i][1];
				}
			} else if (ds.equiv(y, 0)) {
				for (int r = ds.root(x); -1 != r; r = ds.next[r]) {
					ret[r] = (int) nt[i][1];
				}
			}
			ds.setUnion(x, y);
		}
		for (int i = 1; i < N; i++) {
			System.out.println(ret[i] == Q + 1 ? -1 : ret[i]);
		}

	}

	public static class DJSet {
		int n;
		int[] d;
		int[] next;
		int[] last;

		DJSet(int n) {
			this.n = n;
			d = new int[n];
			next = new int[n];
			last = new int[n];
			Arrays.fill(d, -1);
			Arrays.fill(next, -1);
			for (int i = 0; i < n; i++) {
				last[i] = i;
			}
		}

		int root(int x) {
			return d[x] < 0 ? x : (d[x] = root(d[x]));
		}

		boolean setUnion(int x, int y) {
			x = root(x);
			y = root(y);
			if (x != y) {
				if (d[y] < d[x]) {
					int d = x;
					x = y;
					y = d;
				}
				d[x] += d[y];
				d[y] = x;
				next[last[x]] = y;
				last[x] = last[y];
			}
			return x != y;
		}

		boolean equiv(int x, int y) {
			return root(x) == root(y);
		}

		int size(int x) {
			return d[root(x)] * (-1);
		}

		int count() {
			int ct = 0;
			for (int u : d) {
				if (u < 0)
					ct++;
			}
			return ct;
		}
	}

	void run() throws Exception {
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);

		long s = System.currentTimeMillis();
		solver();
		out.flush();
		if (!INPUT.isEmpty())
			tr(System.currentTimeMillis() - s + "ms");
	}

	private static void tr(Object... o) {
		System.out.println(Arrays.deepToString(o));
	}

	public static void main(String[] args) throws Exception {
		new Q416_2().run();
	}

	private byte[] inbuf = new byte[1024];
	private 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 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[] na(int n) {
		int[] a = new int[n];
		for (int i = 0; i < n; i++)
			a[i] = ni();
		return a;
	}

	private int ni() {
		int num = 0, 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 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();
		}
	}

}