int sz = b.size();

string t = b;

b+= t;

int ans = -INF;

for(int i=0; i+sz<2*sz; i++){

int e = i+sz-1;

int cnt_left = 0;

char color = b[i];

int end_left;

for(int s=i; s<i+sz; s++){

if(color=='w' && b[s]!='w'){

color = b[s];

cnt_left++;

continue;

}

if(b[s]==color || b[s]=='w'){

cnt_left++;

end_left = s;

}else{

break;

}

}

if(cnt_left == sz){

fout<<cnt_left<<endl;

return ;

}

int cnt_right = 0;

color = b[i+sz-1];

int end_right;

for(int s=i+sz-1; s>=i; s--){

if(color=='w' && b[s]!='w'){

color = b[s];

cnt_right++;

continue;

}

if(b[s]==color || b[s]=='w'){

cnt_right++;

end_right = s;

}else{

break;

}

}

cout<<"pos "<<i<<" left right "<<cnt_left<<" "<<cnt_right<<endl;

if(end_left>=end_right){

ans = max(cnt_left, cnt_right);

}else{

ans = max(ans, cnt_left+cnt_right);

}

}

fout<<ans<<endl;

while(fin>>N){

fin>>b;

work();

}

return 0;