using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using SB = System.Text.StringBuilder;
//using System.Text.RegularExpressions;
//using System.Globalization;
//using System.Diagnostics;
using static System.Console;
using System.Numerics;
using static System.Math;
using pair = Pair<int, int>;

class Program
{
    static void Main()
    {
        SetOut(new StreamWriter(OpenStandardOutput()) { AutoFlush = false });
        new Program().solve();
        Out.Flush();
    }
    readonly Scanner cin = new Scanner();
    readonly int[] dd = { 0, 1, 0, -1, 0 }; //→↓←↑
    readonly int mod = 1000000007;
    readonly int dom = 998244353;
    bool chmax<T>(ref T a, T b) where T : IComparable<T> { if (a.CompareTo(b) < 0) { a = b; return true; } return false; }
    bool chmin<T>(ref T a, T b) where T : IComparable<T> { if (b.CompareTo(a) < 0) { a = b; return true; } return false; }

    void solve()
    {
        var M = new Map<string, int>(StringComparer.Ordinal, StringComparer.Ordinal);
        int Q = cin.nextint;
        for (int i = 0; i < Q; i++)
        {
            int mode = cin.nextint;
            if (mode == 0)
            {
                M.Add(cin.next, cin.nextint);

            }
            else if (mode == 1)
            {
                WriteLine(M.GetValue(cin.next));
            }
            else if (mode == 2)
            {
                M.Remove(cin.next);
            }
            else if (mode == 3)
            {
                M.GetViewBetween(cin.next, cin.next);
            }
        }
    }

}


class Map<TKey, TValue> where TKey : IComparable<TKey>
{
    SortedSet<TKey> set;
    Dictionary<TKey, TValue> map;
    public Map(IComparer<TKey> comparer, IEqualityComparer<TKey> equalityComparer)
    {
        set = new SortedSet<TKey>(comparer);
        map = new Dictionary<TKey, TValue>(equalityComparer);
    }
    public Map() : this(Comparer<TKey>.Default, EqualityComparer<TKey>.Default) { }

    public void Add(TKey key, TValue value)
    {
        if (!map.ContainsKey(key))
        {
            set.Add(key);
        }
        map[key] = value;
    }
    public TValue GetValue(TKey key)
    {
        if (map.ContainsKey(key))
        {
            return map[key];
        }
        return default(TValue);
    }
    public void Remove(TKey key)
    {
        map.Remove(key);
        set.Remove(key);
    }
    public void GetViewBetween(TKey lowerKey, TKey upperKey)
    {
        foreach (var key in set.GetViewBetween(lowerKey, upperKey))
        {
            WriteLine($"{key} {map[key]}");
        }
    }
}

static class Ex
{
    public static void join<T>(this IEnumerable<T> values, string sep = " ") => WriteLine(string.Join(sep, values));
    public static string concat<T>(this IEnumerable<T> values) => string.Concat(values);
    public static string reverse(this string s) { var t = s.ToCharArray(); Array.Reverse(t); return t.concat(); }

    public static int lower_bound<T>(this IList<T> arr, T val) where T : IComparable<T>
    {
        int low = 0, high = arr.Count;
        int mid;
        while (low < high)
        {
            mid = ((high - low) >> 1) + low;
            if (arr[mid].CompareTo(val) < 0) low = mid + 1;
            else high = mid;
        }
        return low;
    }
    public static int upper_bound<T>(this IList<T> arr, T val) where T : IComparable<T>
    {
        int low = 0, high = arr.Count;
        int mid;
        while (low < high)
        {
            mid = ((high - low) >> 1) + low;
            if (arr[mid].CompareTo(val) <= 0) low = mid + 1;
            else high = mid;
        }
        return low;
    }
}

class Pair<T, U> : IComparable<Pair<T, U>> where T : IComparable<T> where U : IComparable<U>
{
    public T f; public U s;
    public Pair(T f, U s) { this.f = f; this.s = s; }
    public int CompareTo(Pair<T, U> a) => f.CompareTo(a.f) != 0 ? f.CompareTo(a.f) : s.CompareTo(a.s);
    public override string ToString() => $"{f} {s}";
}

class Scanner
{
    string[] s; int i;
    readonly char[] cs = new char[] { ' ' };
    public Scanner() { s = new string[0]; i = 0; }
    public string[] scan => ReadLine().Split();
    public int[] scanint => Array.ConvertAll(scan, int.Parse);
    public long[] scanlong => Array.ConvertAll(scan, long.Parse);
    public double[] scandouble => Array.ConvertAll(scan, double.Parse);
    public string next
    {
        get
        {
            if (i < s.Length) return s[i++];
            string st = ReadLine();
            while (st == "") st = ReadLine();
            s = st.Split(cs, StringSplitOptions.RemoveEmptyEntries);
            i = 0;
            return next;
        }
    }
    public int nextint => int.Parse(next);
    public long nextlong => long.Parse(next);
    public double nextdouble => double.Parse(next);
}



Measured memory_bytes: 49484