#define _USE_MATH_DEFINES //M_PI(π),M_SQRT2(√2) #include //std::cout, std::cin #include //std::string,std::to_string(C++11) #include //std::vector #include //std::valarray #include //std::sort #include //localtime_s #include //abs #include //abs,std::pow,sqrt,sin,cos,round,floor,ceil #include //std::ifstream,std::ofstream #include //std::setprecision,std::setw,std::setfill #include //std::random(C++11) #include //std::accumulate #include //std::greater int main(void) { //test用 //std::ifstream in("test.txt"); //std::cin.rdbuf(in.rdbuf()); //const unsigned int MODULO = 1000000007; //MODULO 10^9+7用 std::string S = ""; std::cin >> S; int hit_t = std::count(S.begin(), S.end(), 't'); int hit_r = std::count(S.begin(), S.end(), 'r'); int hit_e = std::count(S.begin(), S.end(), 'e') / 2; std::cout << std::min(std::min(hit_t, hit_r), hit_e) << std::endl; }