using System;

public class Hello
{
    static void Main()
    {
        Console.ReadLine();
        var s = Console.ReadLine().Trim();
        getAns(s);
    }
    static void getAns(string s)
    {
        var a = new int[26];
        foreach (var x in s) a[x - 'A']++;
        Console.WriteLine(string.Join("", a));
    }
}