import sys
sys.setrecursionlimit(5*10**5)
input = sys.stdin.readline
sys.set_int_max_str_digits(0)
from collections import defaultdict, deque, Counter
from heapq import heappop, heappush
from bisect import bisect_left, bisect_right
from math import gcd, lcm, factorial, perm, comb
from itertools import product, permutations, combinations
from functools import lru_cache #@lru_cache(maxsize=128)
#重複あり：list(product(list('123'),repeat = 2)),重複なし：list(permutations(list('123')))
MOD = 998244353

q = int(input())
for i in range(q):
    n = int(input())
    s = 0
    for i in range(1,n+1):
        s += pow(26,i,MOD)
    print(s%MOD)