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#include<iostream>
#include<string>
using namespace std;
int main() {string ori;cin >> ori;string turn;cin >> turn;int count = 0;while (ori != turn) {for (int i = 0; i < ori.size(); i++) {int flag = 0;if (ori[i] != turn[i]) {flag = 1;if (ori[i] == '*') {ori[i] = 'o';if (ori[i + 1] == '*')ori[i + 1] = 'o';else ori[i + 1] = '*';}else {ori[i] = '*';if (ori[i + 1] == '*')ori[i + 1] = 'o';else ori[i + 1] = '*';}}if (flag) {count++;}}}cout << count << endl;return 0;
}