using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;



class MagicExchangeableWords
{
    static void Main()
    {
        var input = Console.ReadLine().Split();
        var str1 = input[0].ToCharArray();
        var str2 = input[1].ToCharArray();
        char[] longer = str1.Length > str2.Length ? longer = str1 : longer = str2;
        char[] shorter = str1.Length < str2.Length ? shorter = str1 : shorter = str2;
        var pairsOfLetters = new Dictionary<char,char>();
        var IsExchangeable = false;
        if (str1.Length==str2.Length)
        {
            for (int i = 0; i < str1.Length; i++)
            {
                if (!pairsOfLetters.ContainsKey(str1[i]) && !pairsOfLetters.ContainsValue(str1[i]))
                {
                    pairsOfLetters[str1[i]] = str2[i];
                    IsExchangeable = true;
                }
                else
                {
                    if (!pairsOfLetters.ContainsKey(str1[i]))
                    {
                        pairsOfLetters[str1[i]] = str2[i];
                        IsExchangeable = true;
                    }
                    else
                    {

                        if (pairsOfLetters[str1[i]].Equals(str2[i]))
                        {
                            IsExchangeable = true;
                        }
                        else
                        {
                            IsExchangeable = false;
                            break;
                        }
                    }
                }
            }
        }
        else
        {
            for (int i = 0; i < shorter.Length; i++)
            {
                if (!pairsOfLetters.ContainsKey(shorter[i]))
                {
                    pairsOfLetters[shorter[i]] = longer[i];
                    IsExchangeable = true;
                }
                else
                {
                    if (pairsOfLetters[shorter[i]].Equals(longer[i]))
                    {
                        IsExchangeable = true;
                    }
                    else
                    {
                        IsExchangeable = false;
                        break;
                    }
                }
            }
            for (int i = shorter.Length; i < longer.Length; i++)
            {
                for (int j = 0; j < shorter.Length; j++)
                {
                    if (longer[i]==longer[j])
                    {
                        IsExchangeable = true;
                    }
                    else
                    {
                        IsExchangeable = false;
                        break;
                    }
                }
            }
        }
        Console.WriteLine(IsExchangeable.ToString().ToLower());
    }
}