Problem:
Score : 300 points

Problem Statement

You are given strings S and T consisting of lowercase English letters.

You can perform the following operation on S any number of times:

Operation: Choose two distinct lowercase English letters c_1 and c_2, then replace every occurrence of c_1 with c_2, and every occurrence of c_2 with c_1.

Determine if S and T can be made equal by performing the operation zero or more times.

Constraints

1 \leq |S| \leq 2 \times 10^5

|S| = |T|

S and T consists of lowercase English letters.

Input

Input is given from Standard Input in the following format:

S
T

Output

If S and T can be made equal, print Yes; otherwise, print No.

Sample Input 1

azzel
apple

Sample Output 1

Yes

azzel can be changed to apple, as follows:

Choose e as c_1 and l as c_2. azzel becomes azzle.

Choose z as c_1 and p as c_2. azzle becomes apple.

Sample Input 2

chokudai
redcoder

Sample Output 2

No

No sequences of operation can change chokudai to redcoder.

Sample Input 3

abcdefghijklmnopqrstuvwxyz
ibyhqfrekavclxjstdwgpzmonu

Sample Output 3

Yes

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System.Collections.Generic;
using System.Linq;
using System;

public class P
{
    public List<char> a { get; set; }
}

public class Hello
{
    public static void Main()
    {
        var s = Console.ReadLine().Trim();
        var t = Console.ReadLine().Trim();
        var d = new Dictionary<char, P>();
        var d2 = new Dictionary<char, P>();
        if (dcheck(d, s, t) && dcheck(d2, t, s)) Console.WriteLine("Yes");
        else Console.WriteLine("No");
    }
    public static bool dcheck (Dictionary<char, P> d , string s, string t)
    {
        for (int i = 0; i < s.Length; i++)
        {
            if (d.ContainsKey(s[i]))
            {
                if (!d[s[i]].a.Contains(t[i])) d[s[i]].a.Add(t[i]);
            }
            else
            {
                d[s[i]] = new P();
                d[s[i]].a = new List<char>();
                d[s[i]].a.Add(t[i]);
            }
        }
        foreach (var x in d)
        {
            if (x.Value.a.Count() >= 2) return false;
        }
        return true;
    }
}