n,k=map(int,input().split())
mod=998244353

framod=[1]
def framod_calc(n, mod, a=1):
    for i in range(1,n+1):
        a=a * i % mod
        framod.append(a)
framod_calc(k+1, mod)
def combmod(n, k, mod):
    a=framod[n]
    b=framod[k]
    c=framod[n-k]
    return (a * pow(b, mod-2, mod) * pow(c, mod-2, mod)) % mod

ans=0

for i in range(1,k+1):
    tmp=combmod(k,i,mod)*pow(k-i,n,mod)
    if i%2==1:
        ans+=tmp*((2**(i-1))%mod)
        ans%=mod
    else:
        ans-=tmp*((2**(i-1))%mod)
        ans=(ans+mod)%mod

print(ans)