题解 | 小红的白日梦

import sys

n = input()
s = input()
d = input()
ans1 = 0
ans2 = 0
for i in range(0, len(s)):
    if s[i] == "Y":
       ans1 = ans1 + 2
for j in range(0, len(d)):
    if s[j] == "N":
       if d[j] == "Y":
           ans2 = ans2 + 2
    if s[j] == "Y":
        if d[j] == "Y":
           ans2 = ans2 + 1
print(ans1+ans2)