翻硬币_讨论帖

[请叫我问哥]

s = list(input().strip())
t = input().strip()
n = len(s)
pattern = {"*":"o", "o":"*"}
cnt = 0
for i in range(n-1):
    if s[i] != t[i]:
        s[i] = pattern[s[i]]
        s[i+1] = pattern[s[i+1]]
        cnt += 1
print(cnt)