import java.util.*;
public class rampantgrowth_xiaowuc1 {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int r = sc.nextInt();
    int c = sc.nextInt();
    long ret = r;
    for(int i = 1; i < c; i++) {
      ret *= r-1;
      ret %= 998244353;
    }
    System.out.println(ret);
  }
}