import java.util.*;
import java.io.*;
import java.io.BufferedReader;
import java.awt.Point;

public class disrupt{
	public static final String TASKNAME = "disrupt";
	public static long mod= 1000000007;
	public static Debug db;

	public static void main(String[] args) throws IOException {
//		InputReader in = new InputReader(System.in);
//		PrintWriter out = new PrintWriter(System.out);
		InputReader in = new InputReader(new FileInputStream(TASKNAME+".in"));
		PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(TASKNAME+".out")));
		Autocompletion solver = new Autocompletion();
		db=new Debug(System.getSecurityManager()==null);
		solver.solve(1, in, out);
		out.close();
	}
	static class Autocompletion {

		public void solve(int testNumber, InputReader in, PrintWriter out) {
			int n=in.nextInt();
			int m=in.nextInt();
			ArrayList<Integer> adj[]=new ArrayList[n];
			for(int i=0;i<n;i++) {
				adj[i]=new ArrayList<>();
			}
			Pair query[]=new Pair[n-1];
			for(int i=0;i<n-1;i++) {
				int p=in.nextInt()-1;
				int q=in.nextInt()-1;
				query[i]=new Pair(p,q);
				adj[p].add(q);
				adj[q].add(p);
			}
			int depth[]=new int[n];
			int par[]=new int[n];
			ArrayDeque<Integer> dq=new ArrayDeque<Integer>();
			dq.add(0);
			while(!dq.isEmpty()) {
				int x=dq.remove();
				for(Integer a:adj[x]) {
					if(a!=par[x]) {
						par[a]=x;
						dq.add(a);
						depth[a]=depth[x]+1;
					}
				}
			}
			int ans[]=new int[n];
			Arrays.fill(ans, Integer.MAX_VALUE);
			for(int i=0;i<m;i++) {
				int p=in.nextInt()-1;
				int q=in.nextInt()-1;
				int r=in.nextInt();
				if(depth[p]>depth[q]) {
					while(depth[p]!=depth[q]) {
						ans[p]=Math.min(ans[p], r);
						p=par[p];
					}
				}
				if(depth[q]>depth[p]) {
					while(depth[p]!=depth[q]) {
						ans[q]=Math.min(ans[q], r);
						q=par[q];
					}
				}
				while(p!=q) {
					ans[p]=Math.min(ans[p], r);
					ans[q]=Math.min(ans[q], r);
					p=par[p];
					q=par[q];
				}
			}
			for(int i=0;i<n-1;i++) {
				Pair x=query[i];
				if(depth[x.x]>depth[x.y]) {
					if(ans[x.x]==Integer.MAX_VALUE) {
						out.println(-1);
					}
					else {
						out.println(ans[x.x]);
					}
				}
				else {
					if(ans[x.y]==Integer.MAX_VALUE) {
						out.println(-1);
					}
					else {
						out.println(ans[x.y]);
					}
				}
			}
		}

	}
	static class Pair implements Comparable<Pair>{
		int x;
		int y;
		Pair(int a, int b){
			x=a;
			y=b;
		}
		@Override
		public int compareTo(Pair arg0) {
			if(arg0.x!=x)return x-arg0.x;
			return y-arg0.y;
		}
	}
	static class Triple implements Comparable<Triple>{
		int x;
		int y;
		int z;
		Triple(int a, int b, int c){
			x=a;
			y=b;
			z=c;
		}
		@Override
		public int compareTo(Triple arg0) {
			if(arg0.x!=x)return x-arg0.x;
			return y-arg0.y;
		}
	}
	static void bounds() {
		int arr[]=new int[9];
		System.out.println(arr[9]);
	}
	static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }
        public long nextLong() {
        	return Long.parseLong(next());
        }
        public int[] nextIntArr(int n) {
        	int arr[]=new int[n];
        	for(int i=0;i<n;i++) {
        		arr[i]=this.nextInt();
        	}
        	return arr;
        }
    }
	public static class Debug {
        private boolean allowDebug;

        public Debug(boolean allowDebug) {
            this.allowDebug = allowDebug;
        }

        private void outputName(String name) {
            System.out.print(name + " = ");
        }

        public void debug(String name, int x) {
            if (!allowDebug) {
                return;
            }

            outputName(name);
            System.out.println("" + x);
        }

        public void debug(String name, long x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println("" + x);
        }

        public void debug(String name, double x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println("" + x);
        }

        public void debug(String name, int[] x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println(Arrays.toString(x));
        }

        public void debug(String name, long[] x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println(Arrays.toString(x));
        }

        public void debug(String name, double[] x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println(Arrays.toString(x));
        }

        public void debug(String name, Pair[] x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            StringBuilder sb = new StringBuilder("[");
            int cnt=0;
            for(Pair y:x) {
            	sb.append("("+y.x+","+y.y+')');
            	if (cnt != x.length-1)sb.append(", ");
            	cnt++;
            }
            System.out.println(sb.append("]").toString());
        }

        public void debug(String name, Object x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println("" + x);
        }

        public void debug(String name, Object... x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println(Arrays.deepToString(x));
        }
    }
}