new to programming - error reached end of file while parsing

I'm new to programming and trying to write a script that outputs a line containing pangram if the input s is a pangram, or otherwise not pangram. When I compile the script I get an error "reached end of file while parsing." I believe I have balanced parenthesis. Any help would be greatly appreciated.

import java.util.*;

class Main {
    public static void main(String[] args) {

        boolean flag = false;
        Scanner key = new Scanner(System.in);
        String s = key.nextLine();
        String upperCaseStr = s.toUpperCase();

        for(char alphabet = 'A'; alphabet <='Z'; alphabet++) {
            if(upperCaseStr.indexOf(alphabet)==-1){
                flag=true;
                break;
            }  
        }
        if (flag){
            System.out.print("not ");
        }
        System.out.println("pangram");
    }
}