#include <bits/stdc++.h>
using namespace std;

int main() {
    char str[5000];
    cin.getline(str,5000);
    while(str[0]!='*')
    {
        char *p=strtok(str," ");
        char f=toupper(str[0]);
        while(p!=NULL)
        {
            if(toupper(*p)!=f)
                break;
            else
                p=strtok(NULL," ");
        }
        if(p!=NULL)    //While loop terminated but still words are present in the sentence
            cout<<"N"<<endl;
        else
           cout<<"Y"<<endl;
          cin.getline(str,5000);
    }
    // your code goes here
    return 0;
}