#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>
using namespace std;
typedef long long LL;
typedef long double LD;
typedef complex<LD> CMP;

class Stamp { public:
	int getMinimumCost(string desiredColor, int stampCost, int pushCost)
	{
		const int N = desiredColor.size();

		int best = 0x7fffffff;
		for(int L=1; L<=N; ++L) {
			vector<int> dp(N+1, 999);
			dp[0] = 0;
			for(int e=1; e<=N; ++e) {
				set<char> colors;
				for(int s=e-1; s>=0; --s) {
					if(desiredColor[s] != '*')
						colors.insert(desiredColor[s]);
					if(colors.size()<=1 && e-s>=L) {
						int nPush = (e-s+L-1)/L;
						dp[e] = min(dp[e], dp[s]+nPush);
					}
				}
			}
			best = min(best, L*stampCost + dp[N]*pushCost);
		}
		return best;
	}
};

// 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(_, Stamp().getMinimumCost(desiredColor, stampCost, pushCost));}
int main(){

CASE(0)
	string desiredColor = "RRGGBB"; 
	int stampCost = 1; 
	int pushCost = 1; 
	int _ = 5; 
END
CASE(1)
	string desiredColor = "R**GB*"; 
	int stampCost = 1; 
	int pushCost = 1; 
	int _ = 5; 
END
CASE(2)
	string desiredColor = "BRRB"; 
	int stampCost = 2; 
	int pushCost = 7; 
	int _ = 30; 
END
CASE(3)
	string desiredColor = "R*RR*GG"; 
	int stampCost = 10; 
	int pushCost = 58; 
	int _ = 204; 
END
CASE(4)
	string desiredColor = "*B**B**B*BB*G*BBB**B**B*"; 
	int stampCost = 5; 
	int pushCost = 2; 
	int _ = 33; 
END
CASE(5)
	string desiredColor = "*R*RG*G*GR*RGG*G*GGR***RR*GG"; 
	int stampCost = 7; 
	int pushCost = 1; 
	int _ = 30; 
END
/*
CASE(6)
	string desiredColor = ; 
	int stampCost = ; 
	int pushCost = ; 
	int _ = ; 
END
CASE(7)
	string desiredColor = ; 
	int stampCost = ; 
	int pushCost = ; 
	int _ = ; 
END
*/
}
// END CUT HERE
