n = int(input())
se = {"U":0,"F":1,"W":2,"P":3}
s = [[] for i in range(5)]
for i in range(n):
    si,ai = input().split()
    s[se[si]].append(int(ai))

mod = 998244353
ans = 1
for i in range(4):
    cnt = 0
    tot = sum(s[i])
    for j in s[i]:
        if i != 3:
            cnt += (pow(n-1, j, mod) - pow(n-2, j, mod))*pow(n-1, tot-j, mod)
        else:
            cnt += pow(n-1, j, mod) *pow(n-1, tot-j, mod)
        cnt %= mod
    ans *= cnt
    ans %= mod
print(ans)