#define MD 998244353
ll@x1,@y1;
Mint a=x1,b=y1,d=(a-1)*(a-1)+5b*b;
ll@n;
if(d==0){
	if(n==1){
		wt(a,b);
	}else{
		Mint x2=a*a-5b*b;
		Mint y2=2a*b;
		Mint x3=a*x2-5b*y2;
		Mint y3=a*y2+b*x2;
		Mint r=x2==0?y3/y2:x3/x2;
		r**=n-2;
		wt(x2*r,y2*r);
	}
	exit(0);
}
Matrix<Mint>m(2,2),e(2,2),o(2,2);
m[0][0]=a;
m[0][1]=-5b;
m[1][0]=b;
m[1][1]=a;
m**=n;
e[0][0]=1;
e[0][1]=0;
e[1][0]=0;
e[1][1]=1;
m-=e;
o[0][0]=a-1;
o[0][1]=5b;
o[1][0]=-b;
o[1][1]=a-1;
m*=o;
(a,b)=(m[0][0]*a+m[0][1]*b,m[1][0]*a+m[1][1]*b)/d;
wt(a,b);