#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)
#define fore(i,a) for(auto &i:a)
#define all(x) (x).begin(),(x).end()
//#pragma GCC optimize ("-O3")
using namespace std; void _main(); int main() { cin.tie(0); ios::sync_with_stdio(false); _main(); }
typedef long long ll; const int inf = INT_MAX / 2; const ll infl = 1LL << 60;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a = b; return 1; } return 0; }
//---------------------------------------------------------------------------------------------------
/*---------------------------------------------------------------------------------------------------
　　　　　　　　　　　 ∧＿∧  
　　　　　 ∧＿∧ 　（´<_｀ ）　 Welcome to My Coding Space!
　　　　 （ ´_ゝ`）　/　 ⌒i     
　　　　／　　　＼　 　  |　|     
　　　 /　　 /￣￣￣￣/　　|  
　 ＿_(__ﾆつ/　    ＿/ .| .|＿＿＿＿  
　 　　　＼/＿＿＿＿/　（u　⊃  
---------------------------------------------------------------------------------------------------*/





int N;
vector<int> E[101010];
//---------------------------------------------------------------------------------------------------
#define win 1
#define lose 0
int dp[101010];
int dfs1(int cu, int pa = -1) {
    dp[cu] = win;
    fore(to, E[cu]) if (to != pa) if (dfs1(to, cu) == win) dp[cu] = lose;
    return dp[cu];
}
int ans[101010];
void dfs2(int cu, int pa = -1) {
    ans[cu] = win;
    fore(to, E[cu]) if (dp[to] == win) ans[cu] = lose;

    vector<int> wins;
    fore(to, E[cu]) if (dp[to] == win) wins.push_back(to);

    if (wins.size() == 0) {
        dp[cu] = win;
        fore(to, E[cu]) if (to != pa) dfs2(to, cu);
        return;
    } else if(1 < wins.size()) {
        dp[cu] = lose;
        fore(to, E[cu]) if (to != pa) dfs2(to, cu);
        return;
    } else {
        fore(to, E[cu]) if (to != pa) {
            if(wins[0] == to) dp[cu] = win;
            else dp[cu] = lose;
            dfs2(to, cu);
        }
        return;
    }
}
//---------------------------------------------------------------------------------------------------
void _main() {
    cin >> N;
    rep(i, 0, N - 1) {
        int a, b; cin >> a >> b;
        a--; b--;
        E[a].push_back(b);
        E[b].push_back(a);
    }

    dfs1(0);
    dfs2(0);

    vector<int> v;
    rep(i, 0, N) if (ans[i]) v.push_back(i);
    int n = v.size();
    printf("%d\n", n);
    fore(i, v) printf("%d\n", i + 1);
}