UVA - 12243 - Flowers Flourish from France

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuffer sb = new StringBuffer("");
        String m = "";
        while (true) {
            m = br.readLine();
            if (m.equals("*")) {
                break;
            }
            StringTokenizer st = new StringTokenizer(m);
            char tempU = 0, tempL = 0;
            Boolean can = true;
            int n = st.countTokens();
            for (int i = 0; i < n; i++) {
                char temp = st.nextToken().charAt(0);
                if (i == 0) {
                    if (temp > 96) {
                        tempL = temp;
                        tempU = (char) (temp - 32);
                    } else {
                        tempL = (char) (temp + 32);
                        tempU = temp;
                    }
                } else {
                    if (temp != tempU && temp != tempL) {
                        can = false;
                        break;
                    }
                }
            }
            if (can) {
                sb.append("Y\n");
            } else {
                sb.append("N\n");
            }
        }
        System.out.print(sb);
    }
}