//一起翻两个币，没个空隙都由前一个硬币决定翻不翻 所以没个间隙都是确定的
···

include[HTML_REMOVED]

include[HTML_REMOVED]

include[HTML_REMOVED]

using namespace std;

const int N=110;

int n;
char start[N],amd[N];

void turn(int i)
{
if(start[i]==’’) start[i]=’o’;
else start[i]=’’;
}

int main()
{
cin>>start>>amd;
n = strlen(start);

int res=0;
for(int i=0;i<n-1;i++)
{
    if(start[i]!=amd[i])
    {
        turn(i),turn(i+1);
        res++;
    }
}
cout<<res<<endl;

return 0 ;

}
```