Pangrams.java

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;

public class Pangrams {

    // Complete the pangrams function below.
   static String pangrams(String s) {
        s = s.toLowerCase();
        HashSet<Character> h = new HashSet<Character>();
        for(int i=0;i<s.length();i++){
            if(Character.isLetter(s.charAt(i))) {
               h.add(s.charAt(i));
            }
        }
        if(h.size() == 26){
            return "pangram";
        }
        return "not pangram";

     }
    private static final Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) throws IOException {
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        String s = scanner.nextLine();

        String result = pangrams(s);

        bufferedWriter.write(result);
        bufferedWriter.newLine();

        bufferedWriter.close();

        scanner.close();
    }
}