#include <algorithm>
#include <complex>
#include <cstdlib>
#include <ctime>
#include <time.h>
#include <iomanip>
#include <iostream>
#include <map>
#include <math.h>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <numeric>
#include <limits>
#include <type_traits>
#include <locale>
#include <omp.h>

using namespace std;
#define SAY_YES cout << "YES" << endl;
#define SAY_Yes cout << "Yes" << endl;
#define SAY_NO cout << "NO" << endl;
#define SAY_No cout << "No" << endl;
#define IFYES(TRUE_OR_FALSE)   \
    if (TRUE_OR_FALSE)         \
    {                          \
        cout << "YES" << endl; \
    }                          \
    else                       \
    {                          \
        cout << "NO" << endl;  \
    }
#define IFYes(TRUE_OR_FALSE)   \
    if (TRUE_OR_FALSE)         \
    {                          \
        cout << "Yes" << endl; \
    }                          \
    else                       \
    {                          \
        cout << "No" << endl;  \
    }
#define IFyes(TRUE_OR_FALSE)   \
    if (TRUE_OR_FALSE)         \
    {                          \
        cout << "yes" << endl; \
    }                          \
    else                       \
    {                          \
        cout << "no" << endl;  \
    }
#define DEBUG_OUTPUT_ARRAY(XXX, ONE)                            \
    for (int i = 0; i < (ONE); i++)                             \
    {                                                           \
        cout << "DEBUG: i = " << i << " -> " << XXX[i] << endl; \
    }
#define DEBUG_OUTPUT_ARRAY2(XXX, ONE, TWO)                             \
    for (int i = 0; i < (ONE); i++)                                    \
    {                                                                  \
        cout << "<<< i = " << i << " >>>" << endl;                     \
        for (int j = 0; j < (TWO); j++)                                \
        {                                                              \
            cout << "DEBUG: j = " << j << " -> " << XXX[i][j] << endl; \
        }                                                              \
    }
#define DEBUG_OUTPUT_ARRAY2_BOX(XXX, ONE, TWO) \
    for (int i = 0; i < (ONE); i++)            \
    {                                          \
        cout << i << "  ";                     \
        for (int j = 0; j < (TWO); j++)        \
        {                                      \
            cout << XXX[i][j] << " ";          \
        }                                      \
        cout << endl;                          \
    }

typedef pair<long long int, long long int> pll;
typedef pair<long long int, pll> lpll;

const long long int mod = 1000000007;
const long long int INF = 1e18;
const long double PI=3.14159265358979323; 
const long long int pl=1000000;

long long int N,a[100200],b[100200],K=0,nowColor;

vector<long long int>Ed[200200];

bool used[200200]={};
long long int color[200200]={};
queue<long long int>task;
map<pll,long long int>memo;

int main(){

    cout << fixed << setprecision(18);
    cin>>N;
    for(long long int i = 0; i < N-1; i++){
        cin>>a[i]>>b[i];
        a[i]--;
        b[i]--;
        Ed[a[i]].push_back(b[i]);
        Ed[b[i]].push_back(a[i]);
    }
    task.push(0);
    color[0]=-1;
    while(!task.empty()){
        //cout<<task.front()<<endl;
        nowColor=1;
        for(long long int i = 0; i < Ed[task.front()].size(); i++){
            if(nowColor==color[task.front()]){nowColor++;}
            if(color[Ed[task.front()][i]]==0){
                color[Ed[task.front()][i]]=nowColor;
                memo[{min(task.front(),Ed[task.front()][i]),max(task.front(),Ed[task.front()][i])}]=nowColor;
                task.push(Ed[task.front()][i]);    
                nowColor++;
            }
            
        }
        task.pop();
    }
    for(long long int i = 0; i < N-1; i++){
        K=max(K,memo[{a[i],b[i]}]);
    }
    cout<<K<<endl;

    for(long long int i = 0; i < N-1; i++){
        cout<<memo[{a[i],b[i]}]<<endl;
    }
}



Measured memory_bytes: 20476