using System;
using System.Collections.Generic;
using System.Collections;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.IO;
using System.Reflection;
using static System.Math;
using System.Numerics;
static class Program{
	const int mod=(int)1e9+7;
	const double eps=1e-11;
	static void Main(){
		Sc sc=new Sc();
		var s=sc.Ia;
		var hs=new HashSet<int>[s[0]+1];
		for(int i = 1;i<=s[0];i++) {hs[i]=new HashSet<int>();}
		var a=sc.Arr(s[1],()=>sc.Ia);
		var b=new int[s[2]][];
		for(int i = 0;i<s[2];i++) {
			b[i]=sc.Ia;
			hs[b[i][0]].Add(b[i][1]);
		}
		Uf uf=new Uf(s[0]+1);
		for(int i = 0;i<s[1];i++) {
			if(!hs[a[i][0]].Contains(a[i][1])){uf.Union(a[i][0],a[i][1]);}
		}
		var ans=new int[s[0]-1];
		for(int i = 2;i<=s[0];i++) {
			if(uf.Same(1,i)){ans[i-2]=-1;}
		}
		for(int i = s[2]-1;i>=0;i--) {
			int p=-1;
			if(uf.Same(b[i][0],b[i][1])){continue;}
			else if(uf.Same(1,b[i][0])){p=b[i][1];}
			else if(uf.Same(1,b[i][1])){p=b[i][0];}
			else{
				uf.Union(b[i][0],b[i][1]);
				continue;
			}
			uf.Scan(uf.Root(p),uf.Size(p),x=>{ans[x-2]=i+1;});
			uf.Union(b[i][0],b[i][1]);
		}
		Console.WriteLine("{0}",String.Join("\n",ans));
	}
}
public class Uf{
	public class Nd{
		public int n;
		public Nd ne;
		public Nd(int n){this.n=n;}
	}
	private int[] arr,hi;
	public Nd[] f,l;
	public int all;
	public Uf(int n){
		arr=new int[n];
		hi=new int[n];
		f=new Nd[n];
		l=new Nd[n];
		all=n;
		for(int i=0;i<n;i++){
			arr[i]=-1;
			f[i]=l[i]=new Nd(i);
		}
	}
	public bool Union(int a,int b){
		a=Root(a);
		b=Root(b);
		if(a!=b){
			if(hi[a]<hi[b]){a^=b;b^=a;a^=b;}
			arr[a]+=arr[b];
			hi[a]=Max(hi[a],hi[b]+1);
			arr[b]=a;
			all--;
			l[a].ne=f[b];
			l[a]=l[b];
			return true;
		}
		return false;
	}
	public bool Same(int a,int b){return Root(a)==Root(b);}
	public int Size(int a){return -arr[Root(a)];}
	public int Root(int a){return arr[a]<0?a:arr[a]=Root(arr[a]);}
	public void Scan(int a,int m,Action<int> fu){
		var e=f[a];
		for(int j = 0;j<m;j++) {
			fu(e.n);
			e=e.ne;
		}
	}
}
public class Sc{
	public int I{get{return int.Parse(Console.ReadLine());}}
	public long L{get{return long.Parse(Console.ReadLine());}}
	public double D{get{return double.Parse(Console.ReadLine());}}
	public string S{get{return Console.ReadLine();}}
	public int[] Ia{get{return Array.ConvertAll(Console.ReadLine().Split(),int.Parse);}}
	public long[] La{get{return Array.ConvertAll(Console.ReadLine().Split(),long.Parse);}}
	public double[] Da{get{return Array.ConvertAll(Console.ReadLine().Split(),double.Parse);}}
	public string[] Sa{get{return Console.ReadLine().Split();}}
	public object[] Oa{get{return Console.ReadLine().Split();}}
	public int[] Ia2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),int.Parse);}}
	public int[] Ia3(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),int.Parse);}
	public int[] Ia3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).Split(),int.Parse);}
	public long[] La2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),long.Parse);}}
	public long[] La3(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),long.Parse);}
	public long[] La3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).Split(),long.Parse);}
	public double[] Da2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),double.Parse);}}
	public double[] Da3(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),double.Parse);}
	public double[] Da3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).Split(),double.Parse);}
	public T[] Arr<T>(int n,Func<T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f();}return a;}
	public T[] Arr<T>(int n,Func<int,T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i);}return a;}
	public T[] Arr<T>(int n,Func<string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(Console.ReadLine().Split());}return a;}
	public T[] Arr<T>(int n,Func<int,string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i,Console.ReadLine().Split());}return a;}
}