#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

#include <algorithm>
#include <atcoder/all>
#include <bitset>
#include <cassert>
#include <cmath>
#include <ctime>
#include <functional>
#include <iomanip>
#include <iostream>
#include <map>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <tuple>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
using namespace std;
using namespace atcoder;
typedef long long ll;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define repr(i, n) for (int i = (int)(n)-1; i >= 0; i--)
#define repk(i, k, n) for (int i = k; i < (int)(n); i++)
#define all(v) v.begin(), v.end()
#define mod1 1000000007
#define mod2 998244353
#define mod3 100000007
#define vi vector<int>
#define vs vector<string>
#define vc vector<char>
#define vl vector<ll>
#define vb vector<bool>
#define vvi vector<vector<int>>
#define vvc vector<vector<char>>
#define vvl vector<vector<ll>>
#define vvb vector<vector<bool>>
#define vvvi vector<vector<vector<int>>>
#define vvvl vector<vector<vector<ll>>>
#define pii pair<int, int>
#define pil pair<int, ll>
#define pli pair<ll, int>
#define pll pair<ll, ll>
#define vpii vector<pair<int, int>>
#define vpll vector<pair<ll, ll>>
#define vvpii vector<vector<pair<int, int>>>
#define vvpll vector<vector<pair<ll, ll>>>

using mint = modint998244353;

template <typename T>
void debug(T e) {
    cerr << e << endl;
}

template <typename T>
void debug(vector<T> &v) {
    rep(i, v.size()) { cerr << v[i] << " "; }
    cerr << endl;
}

template <typename T>
void debug(vector<vector<T>> &v) {
    rep(i, v.size()) {
        rep(j, v[i].size()) { cerr << v[i][j] << " "; }
        cerr << endl;
    }
}

template <typename T>
void debug(vector<pair<T, T>> &v) {
    rep(i, v.size()) { cerr << v[i].first << " " << v[i].second << endl; }
}

template <typename T>
void debug(set<T> &st) {
    for (auto itr = st.begin(); itr != st.end(); itr++) {
        cerr << *itr << " ";
    }
    cerr << endl;
}

template <typename T>
void debug(multiset<T> &ms) {
    for (auto itr = ms.begin(); itr != ms.end(); itr++) {
        cerr << *itr << " ";
    }
    cerr << endl;
}

template <typename T>
void debug(map<T, T> &mp) {
    for (auto itr = mp.begin(); itr != mp.end(); itr++) {
        cerr << itr->first << " " << itr->second << endl;
    }
}

void debug_out() { cerr << endl; }

template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << H << " ";
    debug_out(T...);
}

ll my_pow(ll x, ll n, ll mod) {
    // 　繰り返し二乗法．x^nをmodで割った余り．
    ll ret;
    if (n == 0) {
        ret = 1;
    } else if (n % 2 == 1) {
        ret = (x * my_pow((x * x) % mod, n / 2, mod)) % mod;
    } else {
        ret = my_pow((x * x) % mod, n / 2, mod);
    }
    return ret;
}

ll inv(ll x, ll mod) { return my_pow(x, mod - 2, mod); }

ll op(ll a, ll b) { return (a + b) % mod2; }

ll e() { return 0LL; }

int main() {
    ll N, M, K, Q;
    cin >> N >> M >> K >> Q;
    vector<ll> A(N);
    for (ll i = 0; i < N; i++) {
        cin >> A[i];
        A[i]--;
    }
    ll inv_m = inv(M - 1, mod2);
    vector<ll> pow_m(N + 1);
    pow_m[0] = 1;
    for (ll i = 0; i < N; i++) {
        pow_m[i + 1] = (pow_m[i] * M) % mod2;
    }
    segtree<ll, op, e> seg1(N);
    segtree<ll, op, e> seg2(N);
    for (ll i = 0; i < N; i++) {
        seg1.set(i, (my_pow(M, K - i, mod2) * A[i]) % mod2);
        seg2.set(i, A[i]);
    }
    for (ll i = 0; i < Q; i++) {
        /*for (ll j = 0; j < N; j++) {
            cout << seg1.get(j) << " ";
        }
        cout << endl;
        for (ll j = 0; j < N; j++) {
            cout << seg2.get(j) << " ";
        }
        cout << endl;*/
        ll t;
        cin >> t;
        if (t == 1) {
            ll l, r;
            cin >> l >> r;
            l--;
            r--;
            ll ans = (r - l + 1);
            ll prd1 = seg1.prod(l, r + 1);
            prd1 = (prd1 * pow_m[l]) % mod2;
            ll prd2 = seg2.prod(l, r + 1);
            ll sums = (prd1 + mod2 - prd2) % mod2;
            sums = (sums * inv_m) % mod2;
            ans = (ans + sums) % mod2;
            cout << ans << endl;
        } else {
            ll x, y;
            cin >> x >> y;
            x--;
            y--;
            seg1.set(x, (my_pow(M, K - x, mod2) * y) % mod2);
            seg2.set(x, y);
        }
    }
}