B'You are given an integer array a_0, a_1, ... , a_{n - 1} , and an integer k . You perform the following code with it: Your task is to calculate the expected value of the variable ans after performing this code. Note that the input is generated according to special rules (see the input format section). The only line contains six integers n , a_0 , x , y , k and M ( 1 <= n <= 10^7 ; 1 <= a_0, x, y < M <= 998244353 ; 1 <= k <= 17 ). The array a in the input is constructed as follows: Let the expected value of the variable ans after performing the code be E . It can be shown that E cdot n^k is an integer. You have to output this integer modulo 998244353 . The array in the first example test is [10, 35, 22] . In the second example, it is [15363, 1418543] . '...