#include <iostream>
#include <sstream>
#include <iomanip>
#include <vector>
#include <string>
#include <map>
#include <set>
#include <algorithm>
#include <numeric>
#include <iterator>
#include <functional>
#include <complex>
#include <queue>
#include <stack>
#include <cmath>
#include <cassert>
#include <tuple>
using namespace std;
typedef long long LL;
typedef complex<double> CMP;

class SwitchingGame { public:
	int timeToWin(vector <string> states)
	{
		const int W = states[0].size();
		string cur(W, '-');

		int sec = 0;
		for(int i=0; i<states.size(); ++i)
		{
			bool need_flip_to_minus = false;
			bool need_flip_to_plus = false;
			for(int k=0; k<W; ++k) {
				if(states[i][k]=='-' && cur[k]=='+')
					need_flip_to_minus = true;
				if(states[i][k]=='+' && cur[k]=='-')
					need_flip_to_plus = true;
			}

			for(int k=0; k<W; ++k) {
				switch(states[i][k])
				{
				case '-':
					cur[k] = '-';
					break;
				case '+':
					cur[k] = '+';
					break;
				case '?':
					for(int j=i+1; j<states.size(); ++j) {
						if(states[j][k]=='-') {if(need_flip_to_minus)cur[k]='-';break;}
						if(states[j][k]=='+') {if(need_flip_to_plus)cur[k]='+';break;}
					}
					break;
				}
			}
			sec += 1 + need_flip_to_plus + need_flip_to_minus;
		}
		return sec;
	}
};

// BEGIN CUT HERE
#include <ctime>
double start_time; string timer()
 { ostringstream os; os << " (" << int((clock()-start_time)/CLOCKS_PER_SEC*1000) << " msec)"; return os.str(); }
template<typename T> ostream& operator<<(ostream& os, const vector<T>& v)
 { os << "{ ";
   for(typename vector<T>::const_iterator it=v.begin(); it!=v.end(); ++it)
   os << '\"' << *it << '\"' << (it+1==v.end() ? "" : ", "); os << " }"; return os; }
void verify_case(const int& Expected, const int& Received) {
 bool ok = (Expected == Received);
 if(ok) cerr << "PASSED" << timer() << endl;  else { cerr << "FAILED" << timer() << endl;
 cerr << "\to: \"" << Expected << '\"' << endl << "\tx: \"" << Received << '\"' << endl; } }
#define CASE(N) {cerr << "Test Case #" << N << "..." << flush; start_time=clock();
#define END	 verify_case(_, SwitchingGame().timeToWin(states));}
int main(){

CASE(1)
	string states_[] = {"+-++",
 "+-++"};
	  vector <string> states(states_, states_+sizeof(states_)/sizeof(*states_)); 
	int _ = 3; 
END
CASE(0)
	string states_[] = {"++--",
 "--++"};
	  vector <string> states(states_, states_+sizeof(states_)/sizeof(*states_)); 
	int _ = 5; 
END
CASE(2)
	string states_[] = {"++",
 "+?",
 "?+",
 "++"};
	  vector <string> states(states_, states_+sizeof(states_)/sizeof(*states_)); 
	int _ = 5; 
END
CASE(3)
	string states_[] = {"+", 
 "?",
 "?",
 "?",
 "-"};
	  vector <string> states(states_, states_+sizeof(states_)/sizeof(*states_)); 
	int _ = 7; 
END
CASE(4)
	string states_[] = {"+??+++",
 "++??+-",
 "?++??+",
 "?-+-??",
 "??+?++",
 "++-?+?",
 "?++?-+",
 "?--+++",
 "-??-?+"}
;
	  vector <string> states(states_, states_+sizeof(states_)/sizeof(*states_)); 
	int _ = 20; 
END
/*
CASE(5)
	string states_[] = ;
	  vector <string> states(states_, states_+sizeof(states_)/sizeof(*states_)); 
	int _ = ; 
END
CASE(6)
	string states_[] = ;
	  vector <string> states(states_, states_+sizeof(states_)/sizeof(*states_)); 
	int _ = ; 
END
*/
}
// END CUT HERE
