import java.io.BufferedReader;
import java.io.FileReader;
import java.util.Enumeration;
import java.util.Hashtable;

public class Frecuencia {
  public static String alfabeto="ABCDEFGHIJKLMNOPQRSTUVWXYZ";

  private Hashtable<Character,Integer>list;

  public Frecuencia() {
    list=new Hashtable<Character,Integer>();
    for(int n=0;n<alfabeto.length();n++) 
      list.put(alfabeto.charAt(n),0);
  }

  public void add(char a) {
    Character c=Character.toUpperCase(a);
    if( list.containsKey(c)) list.put(c,list.get(c)+1);
    else System.err.println("Skipping character "+a);
  }

  public int get(Character a) { return list.get(a); }

  public void print() {
    for(int n=0;n<alfabeto.length();n++) {
      Character c= new Character(alfabeto.charAt(n));
      System.out.println(c.toString()+" "+get(c));
    }
  }
  
  private void psort(Hashtable<Character,Integer>a) {
    Character max=null;
    Hashtable<Character,Integer> ht=new Hashtable<Character,Integer>(a);
    for (Enumeration<Character> e=ht.keys(); e.hasMoreElements();) {
      Character c=e.nextElement();
      if (max==null) {max=c; continue;}
      if ( ht.get(max).compareTo(ht.get(c))<0) max=c;
    }
    System.out.println(max.toString()+" "+ht.get(max));
    ht.remove(max);
    if(ht.size()==0) return;
    psort(ht);
  }
  
  public void printSorted() { psort(list); } 

  public static void main(String [] args) {
    if (args.length!=1) {
      System.err.println("Uso: Frecuenca <fichero>");
      System.exit(0);
    }
    Frecuencia f=new Frecuencia();
    try {
      String line;
      FileReader file= new FileReader(args[0]);
      BufferedReader br= new BufferedReader(file);
      while ( (line=br.readLine())!=null) {
        for(int n=0; n<line.length();n++) {
          char c=line.charAt(n);
          // skip blanks
          if (Character.isWhitespace(c))continue;
          f.add(c);
        }
      }
      br.close();
      f.printSorted();
    } catch (Exception e) {
      System.err.println(e.toString());
    }
    
  }
}