include [HTML_REMOVED]

include[HTML_REMOVED]

using namespace std;

define inf 0x3f3f3f3f

typedef long long ll;
typedef pair[HTML_REMOVED] P;

define pi 3.141592653589793238

int mov[4][2]= {{-1,0},{0,1},{1,0},{0,-1}};
int month[13]= {0,31,0,31,30,31,30,31,31,30,31,30,31};

const int N=10100;
const int M=1e9+7;

int n;
string s;

int dfs(int &i){
int x=0;
int res=0;
bool flag=false;

while(i<n){
    if(s[i]=='x'){
        x++;
    }else if(s[i]=='|'){
        res=max(res,x);
        x=0;
        flag=true;
    }else if(s[i]=='('){
        x+=dfs(++i);
    }else if(s[i]==')'){
        if(flag){
            res=max(res,x);
        }else{
            res=x;
        }
        return res;
    }
    i++;
}
if(flag){
    res=max(res,x);
}else{
    res=x;
}
return res;

}

int main()
{

ios::sync_with_stdio(false);
cin.tie(0);


while(cin>>s){
    n=s.length();
    int i=0;
    cout<<dfs(i)<<endl;
}

return 0;

}