#include <bits/stdc++.h> 
using namespace std;
using ll =long long;
#define all(v) v.begin(),v.end()
 #define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)

ll INF=2e18;
 
const ll MOD = 998244353;
vector<long long> fact, fact_inv, inv;

void init_nCk(int SIZE) {
    fact.resize(SIZE + 5);
    fact_inv.resize(SIZE + 5);
    inv.resize(SIZE + 5);
    fact[0] = fact[1] = 1;
    fact_inv[0] = fact_inv[1] = 1;
    inv[1] = 1;
    for (int i = 2; i < SIZE + 5; i++) {
        fact[i] = fact[i - 1] * i % MOD;
        inv[i] = MOD - inv[MOD % i] * (MOD / i) % MOD;
        fact_inv[i] = fact_inv[i - 1] * inv[i] % MOD;
    }
}


long long nCk(int n, int k) {
    if((n < k)) return 0;
     if ((n < 0 || k < 0)) return 0;
    return fact[n] * (fact_inv[k] * fact_inv[n - k] % MOD) % MOD;
}

long long nPk(int n, int k) {
    if((n < k)) return 0;
     if ((n < 0 || k < 0)) return 0;
    return fact[n] * fact_inv[n - k] % MOD;
}
 

ll mod_pow(ll x,ll n,ll mod) {
ll res=1;
  while(n>0) {
if(n&1) {
res=res*x%mod;
}
   x=x*x%mod;
    n>>=1;
  }
return res;
}
 
int main() {
    ios::sync_with_stdio(false);
  cin.tie(0);
ll N,K;cin>>N>>K;

init_nCk(K+100);
ll ans=nCk(K,2)*N*2%MOD;

ll x=mod_pow(K,MOD-2,MOD);
for(ll i=0;i<N;i++) {
  ans*=x;
  ans%=MOD;
}

if(ans<0) ans+=MOD;
cout<<ans<<endl;
}