#include <iostream> #include <string> using namespace std; int main() { string s, t; cin >> s >> t; int n = s.size(); int res = 0; for (int i = 0; i < n - 1; ++i) { if (s[i] != t[i]) { // 翻转第i个和第i+1个 s[i] = (s[i] == '*' ? 'o' : '*'); s[i+1] = (s[i+1] == '*' ? 'o' : '*'); res++; } } cout << res << endl; return 0; }