using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using Enu = System.Linq.Enumerable;

public class Program
{
    Dictionary<long, int> dic = new Dictionary<long, int>();
    static readonly long Mod0 = (long)1e9 + 7, Mod1 = (long)1e9 + 9;
    int N;
    RangeCoefAddSumSegTree seg1, seg2;

    public void Solve()
    {
        N = Reader.Int();
        int NQ = Reader.Int();
        var Q = Reader.StringTable(NQ);
        Init();
        dic[0] = 0;
        var ans = new List<int>();
        for (int qi = 0; qi < NQ; qi++)
            if (Q[qi][0] == "!") Add(int.Parse(Q[qi][1]), int.Parse(Q[qi][2]), int.Parse(Q[qi][3]), qi + 1);
            else ans.Add(dic[Key()]);
        Console.WriteLine(string.Join("\n", ans));
    }

    void Init()
    {
        var random = new Random();
        var C = new int[N];

        long mult = random.Next((int)1e7 + 1, (int)Mod0);
        for (long i = 0, m = 1; i < N; i++, m = m * mult % Mod0) C[i] = (int)m;
        seg1 = new RangeCoefAddSumSegTree(N, C, (int)Mod0);

        mult = random.Next((int)1e7 + 1, (int)Mod1);
        for (long i = 0, m = 1; i < N; i++, m = m * mult % Mod1) C[i] = (int)m;
        seg2 = new RangeCoefAddSumSegTree(N, C, (int)Mod1);
    }

    long Key() { return seg1.Sum() << 32 | seg2.Sum(); }

    void Add(int L, int R, int val, int time)
    {
        seg1.Add(L, R, val);
        seg2.Add(L, R, val);
        long key = Key();
        if (!dic.ContainsKey(key)) dic[key] = time;
    }
}

class RangeCoefAddSumSegTree
{
    public readonly int N, Mod;
    private readonly long[] V, S, Mult;

    public RangeCoefAddSumSegTree(int n, int[] mult, int mod)
    {
        for (N = 2; N < n; ) N *= 2;
        Mod = mod;
        V = new long[N * 2];
        S = new long[N * 2];
        Mult = new long[N + 1];
        for (int i = 0; i < mult.Length; i++)
            Mult[i + 1] = (Mult[i] + mult[i]) % Mod;
    }

    public long Sum(int L = 0, int R = int.MaxValue) { return Sum(0, 0, N, L, R); }
    private long Sum(int i, int currL, int currR, int L, int R)
    {
        if (currL >= R || currR <= L) return 0;
        if (currL >= L && currR <= R)
            return ((S[i] + V[i] * (Mod + Mult[currR] - Mult[currL])) % Mod + Mod) % Mod;
        long res = V[i] * (Mod + Mult[Math.Min(currR, R)] - Mult[Math.Max(currL, L)]) % Mod;
        int mid = (currL + currR) >> 1;
        res = (res + Sum(i * 2 + 1, currL, mid, L, R)) % Mod;
        res = (res + Sum(i * 2 + 2, mid, currR, L, R)) % Mod;
        return res;
    }

    public void Add(int L, int R, long val) { Add(0, val, 0, N, L, R); }
    private void Add(int i, long val, int currL, int currR, int L, int R)
    {
        if (currL >= R || currR <= L) return;
        if (currL >= L && currR <= R) { V[i] = (V[i] + val) % Mod; return; }
        S[i] = (S[i] + val * (Mod + Mult[Math.Min(currR, R)] - Mult[Math.Max(currL, L)])) % Mod;
        int mid = currL + currR >> 1;
        Add(i * 2 + 1, val, currL, mid, L, R);
        Add(i * 2 + 2, val, mid, currR, L, R);
    }
}


class Entry { static void Main() { new Program().Solve(); } }
class Reader
{
    static TextReader reader = Console.In;
    static readonly char[] separator = { ' ' };
    static readonly StringSplitOptions op = StringSplitOptions.RemoveEmptyEntries;
    static string[] A = new string[0];
    static int i;
    static void Init() { A = new string[0]; }
    public static void Set(TextReader r) { reader = r; Init(); }
    public static void Set(string file) { reader = new StreamReader(file); Init(); }
    public static bool HasNext() { return CheckNext(); }
    public static string String() { return Next(); }
    public static int Int() { return int.Parse(Next()); }
    public static long Long() { return long.Parse(Next()); }
    public static double Double() { return double.Parse(Next()); }
    public static int[] IntLine() { return Array.ConvertAll(Split(Line()), int.Parse); }
    public static int[] IntArray(int N) { return Range(N, Int); }
    public static int[][] IntTable(int H) { return Range(H, IntLine); }
    public static string[] StringArray(int N) { return Range(N, Next); }
    public static string[][] StringTable(int N) { return Range(N, () => Split(Line())); }
    public static string Line() { return reader.ReadLine().Trim(); }
    public static T[] Range<T>(int N, Func<T> f) { var r = new T[N]; for (int i = 0; i < N; r[i++] = f()) ; return r; }
    static string[] Split(string s) { return s.Split(separator, op); }
    static string Next() { CheckNext(); return A[i++]; }
    static bool CheckNext()
    {
        if (i < A.Length) return true;
        string line = reader.ReadLine();
        if (line == null) return false;
        if (line == "") return CheckNext();
        A = Split(line);
        i = 0;
        return true;
    }
}