MFLAR10 Compilation error

[lalaland]

This is my code need help .the online judge tells me it's a compilation error . I've tried many sample input !
another Question is the problem asks me to ensure that the sentence contains only letters + white spaces ??? Thanks in advance

package poetry;
import java.io.*;
public class Poetry {
    public static void main  (String[] args) throws IOException {
        String sentence ;
        String [] tokens ;
        InputStreamReader input = new InputStreamReader (System.in);
        BufferedReader reader = new BufferedReader (input);
        sentence = reader.readLine () ;      
        while (! (sentence.equals("*"))) {
        tokens = sentence.split (" ") ;
        int t ;
        char temp = tokens[0].charAt(0); 
        char sec ;
       if (Character.isLowerCase(temp) ) {
           sec = Character.toUpperCase (temp) ; }
       else
       { sec = Character.toLowerCase (temp) ;}
        for ( t = 1 ; t <tokens.length ; t++ ){
            if (tokens[t].charAt(0) == temp || tokens[t].charAt(0) == sec ){ continue ;}
            else { break ;}
        }//end for loop
        if (t == tokens.length ) {System.out.println("Y") ;}
        else {System.out.println("N") ;}
         sentence = reader.readLine () ;  
        }//end while
    }
}