using System;
using System.Collections.Generic;
using System.IO;

namespace prD {
    class Program {
#if ONLINE_JUDGE
        private static readonly StreamReader reader = new StreamReader(Console.OpenStandardInput(1024 * 10), System.Text.Encoding.ASCII, false, 1024 * 10);
        private static readonly StreamWriter writer = new StreamWriter(Console.OpenStandardOutput(1024 * 10), System.Text.Encoding.ASCII, 1024 * 10);
#else
        private static readonly StreamWriter writer = new StreamWriter(@"..\..\output");
        private static readonly StreamReader reader = new StreamReader(@"..\..\input");
#endif

        static void Main(string[] args) {
            int n = NextInt();
            int[] ans = new int[n];
            int[,] a = new int[n, 2];
            int i1 = 0;
            for (int i = 0; i < n; i++) {
                a[i, 0] = NextInt();
                a[i, 1] = NextInt();
                if (i == 0)
                    continue;
                if (a[i, 0] == 1) {
                    if (a[i, 1] == a[0, 0] || a[i, 1] == a[0, 1]) {
                        i1 = i;
                    }
                }
                else if (a[i, 1] == 1) {
                    if (a[i, 0] == a[0, 0] || a[i, 0] == a[0, 1]) {
                        i1 = i;
                    }
                }
            }
            ans[0] = 1;
            ans[1] = a[i1, 0] == 1 ? a[i1, 1] : a[i1, 0];
            for (int i = 0; i < n - 2; i++) {
                int a0 = a[ans[i] - 1, 0];
                int a1 = a[ans[i] - 1, 1];
                ans[i + 2] = a0 == ans[i + 1] ? a1 : a0;
            }
            for (int i = 0; i < n; i++) {
                writer.Write(ans[i]);
                writer.Write(' ');
            }
            writer.Flush();
#if !ONLINE_JUDGE
            writer.Close();
#endif
        }
        private static int NextInt() {
            int c;
            int res = 0;
            do {
                c = reader.Read();
                if(c == -1)
                    return res;
            } while(c != '-' && (c < '0' || c > '9'));
            int sign = 1;
            if(c == '-') {
                sign = -1;
                c = reader.Read();
            }
            res = c - '0';
            while(true) {
                c = reader.Read();
                if(c < '0' || c > '9')
                    return res * sign;
                res *= 10;
                res += c - '0';
            }
        }
        private static long NextLong() {
            int c;
            long res = 0;
            do {
                c = reader.Read();
                if(c == -1)
                    return res;
            } while(c != '-' && (c < '0' || c > '9'));
            int sign = 1;
            if(c == '-') {
                sign = -1;
                c = reader.Read();
            }
            res = c - '0';
            while(true) {
                c = reader.Read();
                if(c < '0' || c > '9')
                    return res * sign;
                res *= 10;
                res += c - '0';
            }
        }
    }
}