#include <bits/stdc++.h>
#define int long long
#define ALL(x) x.begin(), x.end()
#define SZ(x) ((int)x.size())
#define fastio ios::sync_with_stdio(0), cin.tie(0);
using namespace std;

#ifdef LOCAL
#define cout cout << "\033[0;32m"
#define cerr cerr << "\033[0;31m"
#define endl "\n" << "\033[0m"
#else
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,avx2,sse,sse2,sse3,sse4,popcnt")
#define endl "\n"
#endif

const int MAX_N = 5e5+10;
const int INF = 2e18;
const int MOD = 998244353;

// declare
int n, m;

int qp(int b, int p, int m){
	int ret = 1;
	for ( ; p ; p>>=1){
		if (p&1) ret = ret*b%m;
		b = b*b%m;
	}
	return ret;
}

void solve1(){

	// input
	cin >> n >> m;

	// output
	cout << (n-m+1)*qp(n+1, m-1, MOD)%MOD << endl;

    return;
}

signed main(){

    fastio;

    int t = 1;
    while (t--){
        solve1();
    }

    return 0;
}