#include <bits/stdc++.h>
using namespace std;

#define ALL(x) (x).begin(),(x).end()
#define IO ios::sync_with_stdio(false),cin.tie(nullptr);
#define LB(v, x) (ll)(lower_bound(ALL(v),x)-(v).begin())
#define UQ(v) sort(ALL(v)),(v).erase(unique(ALL(v)),v.end())
#define REP(i, n) for(ll i=0; i<(ll)(n); i++)
#define FOR(i, a, b) for(ll i=(ll)(a); (a)<(b) ? i<(b) : i>(b); i+=((a)<(b) ? 1 : -1))
#define chmax(a, b) ((a)<(b) ? ((a)=(b), 1) : 0)
#define chmin(a, b) ((a)>(b) ? ((a)=(b), 1) : 0)

template<typename T> using rpriority_queue=priority_queue<T,vector<T>,greater<T>>;
using ll=long long; const int INF=1e9+10; const ll INFL=4e18;
using ld=long double; using ull=uint64_t; using LL=__int128_t;
using VI=vector<int>; using VVI=vector<VI>; using VL=vector<ll>; using VVL=vector<VL>;
using PL=pair<ll,ll>; using VP=vector<PL>; using WG=vector<vector<pair<int,ll>>>;



template<typename Monoid>
struct SegTreeDyanamic {
    using Type=typename Monoid::Type;
    struct Node {
        Type value;
        array<int,2> to;
        ll left,right;
        Node(ll l, ll r) {
            to.fill(-1);
            left=l; right=r;
        }
    };
    vector<Node> node;

    ll mx=1e9;
    vector<int> route;
    SegTreeDyanamic(ll mx=1e9, int q=5e5) {
        this->mx=mx;
        node.reserve(q);
        node.push_back(Node(0,mx));
        route.reserve(100);
    }

    void set(ll i, Type v) {
        ll left=0,right=mx,cur=0;
        route.clear();
        while(left<right-1) {
            ll mid=(left+right)/2;

            int nxt,toi;
            if(i<mid) nxt=node[cur].to[0],toi=0; //左
            else nxt=node[cur].to[1],toi=1; //右

            if(nxt==-1) {
                nxt=node.size();
                node[cur].to[toi]=nxt;

                if(toi==0) node.push_back(Node(left,mid));
                else node.push_back(Node(mid,right));
            }

            if(i<mid) right=mid;
            else left=mid;

            route.push_back(cur);
            cur=nxt;
        }
        reverse(ALL(route));
        node[cur].value=v;

        for(int r:route) {
            int leftc=node[r].to[0],rightc=node[r].to[1];
            Type leftv= leftc==-1 ? Monoid::id() : node[leftc].value;
            Type rightv= rightc==-1 ? Monoid::id() : node[rightc].value;
            node[r].value=Monoid::op(leftv,rightv);
        }
    }

    Type fold(ll l, ll r) {
        auto dfs=[&](auto&& dfs, int idx, ll left, ll right)-> Type {
            if(right<l) return Monoid::id();
            if(left>r) return Monoid::id();
            if(l<=left&&right<=r) return node[idx].value;

            ll mid=(left+right)/2;
            int leftc=node[idx].to[0],rightc=node[idx].to[1];

            Type leftv,rightv;
            if(leftc==-1) leftv=Monoid::id();
            else leftv=dfs(dfs,leftc,left,mid);

            if(rightc==-1) rightv=Monoid::id();
            else rightv=dfs(dfs,rightc,mid,right);

            return Monoid::op(leftv,rightv);
        };

        return dfs(dfs,0,0,mx);
    }
};


/// @brief ModInt
template<ll MOD>
struct ModInt{
    ModInt(ll x=0){ value=(x>=0?x%MOD:MOD-(-x)%MOD); }

    ModInt operator-() const { return ModInt(-value); }
    ModInt operator+() const { return ModInt(*this); }
    ModInt& operator+=(const ModInt& other) {
        value+=other.value;
        if(value>=MOD) value-=MOD;
        return*this;
    }
    ModInt& operator-=(const ModInt& other) {
        value+=MOD-other.value;
        if(value>=MOD) value-=MOD;
        return*this;
    }
    ModInt& operator*=(const ModInt other) {
        value=value*other.value%MOD;
        return*this;
    }
    ModInt& operator/=(ModInt other) {
        (*this)*=other.inv();
        return*this;
    }
    ModInt operator+(const ModInt& other) const { return ModInt(*this)+=other; }
    ModInt operator-(const ModInt& other) const { return ModInt(*this)-=other; }
    ModInt operator*(const ModInt& other) const { return ModInt(*this)*=other; }
    ModInt operator/(const ModInt& other) const { return ModInt(*this)/=other; }
    bool operator==(const ModInt& other) const { return value==other.value; }
    bool operator!=(const ModInt& other) const { return value!=other.value; }
    friend ostream& operator<<(ostream& os, const ModInt& x) { return os<<x.value; }
    friend istream& operator>>(istream& is, ModInt& x) {
        ll v;
        is>>v;
        x=ModInt<MOD>(v);
        return is;
    }

    ModInt pow(ll x) const { 
        ModInt ret(1),mul(value);
        while(x) {
            if(x&1) ret*=mul;
            mul*=mul;
            x>>=1;
        }
        return ret;
    }
    ModInt inv() const { return pow(MOD-2); }
    ll val() {return value; }
    static constexpr ll get_mod() { return MOD; }

private:
    ll value;
};

using Mod998=ModInt<998244353>;
using Mod107=ModInt<1000000007>;
using VM=vector<Mod998>;

using mint=Mod998;
//----------------------------------------------------------


struct Mon {
    using Type=pair<mint,mint>;
    static Type op(Type l, Type r) {
        l.first=l.first*r.first;
        l.second=r.first*l.second+r.second;
        return l;
    }
    static Type id() { return { mint(1), mint(0) }; }
};

int main() {
    IO;
    ll N,Q; cin>>N>>Q;
    
    SegTreeDyanamic<Mon> seg(N);

    while(Q--) {
        int t; cin>>t;

        if(t==0) {
            ll p,c,d; cin>>p>>c>>d;
            seg.set(p,{c,d});
        }

        else {
            ll l,r,x; cin>>l>>r>>x;
            auto [a,b]=seg.fold(l,r);
            mint ans=a*x+b;
            cout<<ans<<'\n';
        }
    }
}