/* Example of STL set - revision of set.cc
 * This version copies an array of strings into a set
 * compile:  g++ -g  copyToSet.cc
 * run:      echo A C- E F | a.out
 * output:   Y N Y N
 * The arguments from echo are each tested to see if they are in the set
 */
#include<set>
#include<iostream>
#include<string>
#include<algorithm>
int main(int argc, char** argv) { 
 std::string as[7] ={"A+","A","A-","B+","B","B-","E"};
 std::set<std::string> acceptable;
 std::copy( as, as+7, std::inserter(acceptable, acceptable.begin()));
 std::string next;
 while ( std::cin >> next )
   std::cout << (acceptable.count( next ) ? "Y " : "N ");
}