import java.io.*;
import java.util.*;
public class R628C {
    public static void main(String[] args) throws Exception {
        BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
        int N=Integer.parseInt(in.readLine());
        List<List<Integer>> //neighbors=new ArrayList<>(),
                edgeidxs=new ArrayList<>();
        for (int i=0; i<N; i++) {
            //neighbors.add(new ArrayList<>());
            edgeidxs.add(new ArrayList<>());
        }
        int[] deg=new int[N];
        for (int i=0; i<N-1; i++) {
            StringTokenizer tok=new StringTokenizer(in.readLine());
            int u=Integer.parseInt(tok.nextToken())-1,
                    v=Integer.parseInt(tok.nextToken())-1;
            //neighbors.get(u).add(v);
            edgeidxs.get(u).add(i);
            //neighbors.get(v).add(u);
            edgeidxs.get(v).add(i);
            deg[u]++;
            deg[v]++;
        }
        int rt=0;
        while (rt<N && deg[rt]<3)
            rt++;
        int[] labels=new int[N-1];
        Arrays.fill(labels,-1);
        if (rt==N) {
            //path tree
            for (int i=0; i<N-1; i++)
                labels[i]=i;
            return;
        }
        else {
            for (int ni = 0; ni < 3; ni++)
                labels[edgeidxs.get(rt).get(ni)] = ni;
            for (int e = 0, l = 3; e < N - 1; e++) {
                if (labels[e] == -1) {
                    labels[e] = l;
                    l++;
                }
            }
        }
        StringBuilder s=new StringBuilder();
        for (int l:labels)
            s.append(l).append("\n");
        System.out.println(s);
    }
}