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

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int m = sc.nextInt();
        UnionFindTree uft = new UnionFindTree(n);
        for (int i = 0; i < n; i++) {
            int left = sc.nextInt() - 1;
            int right = sc.nextInt() - 1;
            int value = sc.nextInt();
            if (uft.same(left, right)) {
                if ((uft.getValue(left) ^ uft.getValue(right)) != value)  {
                    System.out.println(-1);
                    return;
                }
            } else {
                uft.unite(left, right, value);
            }
        }
        System.out.println(String.join("\n", Arrays.stream(uft.values).mapToObj(String::valueOf).toArray(String[]::new)));
    }
    
    static class UnionFindTree {
        int[] parents;
        int[] values;
        
        public UnionFindTree(int size) {
            parents = new int[size];
            values = new int[size];
            for (int i = 0; i < size; i++) {
                parents[i] = i;
            }
        }
        
        public int find(int x) {
            if (x == parents[x]) {
                return x;
            } else {
                int p = find(parents[x]);
                if (parents[x] != parents[parents[x]]) {
                    values[x] ^= values[parents[x]];
                }
                return parents[x] = p;
            }
        }
        
        public boolean same(int x, int y) {
            return find(x) == find(y);
        }
        
        public void unite(int x, int y, int v) {
            int xx = find(x);
            int yy = find(y);
            if (xx == yy) {
                return;
            }
            parents[yy] = xx;
            values[yy] ^= values[x] ^ values[y] ^ v;
        }
        
        public int getValue(int x) {
            find(x);
            if (x == parents[x]) {
                return values[x];
            } else {
                return values[x] ^ values[parents[x]];
            }
        }
    }
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}