Quick Brown Fox Solution:

import java.util.HashSet;
import java.util.Scanner;

public class Kattis {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int cases = Integer.parseInt(sc.nextLine());
    for (int i = 0; i < cases; i++) {
      HashSet<Character> hs = new HashSet<>();
      String line = sc.nextLine();
      for (int j = 0; j < line.length(); j++) {
        hs.add(Character.toLowerCase(line.charAt(j)));
      }
      StringBuilder sb = new StringBuilder();
      for (int j = 'a'; j <= 'z'; j++) {
        if(!hs.contains((char) j))
          sb.append((char) j);
      }
      if(sb.length() == 0)
        System.out.println("pangram");
      else{
        System.out.println("missing " + sb);
      }
    }
  }
}