using System;
using System.Collections.Generic;


namespace Magic_Exchangeable_Words
{
    class Program
    {
        static void Main(string[] args)
        {
            var input = Console.ReadLine().Split(' ');
            var mapping = new Dictionary<char,char>();

            string firstWord = input[0];
            string secondWord = input[1];

            bool exchangeable = true;

            for (int i = 0; i < Math.Max(firstWord.Length,secondWord.Length); i++)
            {
                if (i<Math.Min(firstWord.Length,secondWord.Length))
                {
                    if (mapping.ContainsKey(firstWord[i])==false)
                    {
                        mapping.Add(firstWord[i],secondWord[i]);
                    }
                    else
                    {
                        if (mapping[firstWord[i]]!=secondWord[i])
                        {
                            exchangeable = false;
                            break;
                        }
                    }
                }
                else
                {
                    if (firstWord.Length>secondWord.Length&&mapping.ContainsKey(firstWord[i])==false)
                    {
                        exchangeable = false;
                        break;
                    }
                    else if(firstWord.Length < secondWord.Length&&mapping.ContainsValue(secondWord[i])==false)
                    {
                        exchangeable = false;
                        break;
                    }
                }
            }

            Console.WriteLine(exchangeable.ToString().ToLower());
        }
    }
}