/*Bismillah*/
#include<stdio.h>
#include<string.h>
int main()
{
    char s[1500];
    while(1)
    {
        gets(s);
        if(s[0]=='*')
        {
            break;
        }

        else
        {
            int l,i,flag=1;
            char c[2];
            l=strlen(s);
            if(s[0]>=65&&s[0]<=90)
                c[0]=s[0]+32;
            else if(s[0]>=97&&s[0]<=122)
                c[0]=s[0]-32;
            for(i=1;i<=l;i++)
            {
                if(s[i]==' ')
                {
                    if(s[i+1]==s[0]||s[i+1]==c[0])
                    {

                        continue;
                    }
                    else
                    {
                        flag=0;
                        break;
                    }
                }
            }
            if(flag==1)
                printf("Y\n");
            else
                printf("N\n");
        }
    }
    return 0;
}