MagicExchangeableWords

using System;
using System.Collections.Generic;

namespace MagicExchangableWords
{
    public class MagicExchangableWords
    {
        public static void Main()
        {
            string[] inputLine = Console.ReadLine().Split();

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

            Dictionary<char, char> mappedChars = new Dictionary<char, char>();

            int smallerLen = Math.Min(firstWord.Length, secondWord.Length);

            bool isExchangable = true;
            for (int currSymbol = 0; currSymbol < smallerLen; currSymbol++)
            {
                char firstSymbol = firstWord[currSymbol];
                char secondSymbol = secondWord[currSymbol];

                if (!mappedChars.ContainsKey(firstSymbol))
                {
                    mappedChars[firstSymbol] = secondSymbol;
                }
                else
                {
                    if (mappedChars[firstSymbol] != secondSymbol)
                    {
                        isExchangable = false;

                        break;
                    }
                }
            }

            if (!isExchangable)
            {
                Console.WriteLine("false");

                return;
            }

            for (int currSymbol = smallerLen; currSymbol < firstWord.Length; currSymbol++)
            {
                char symbol = firstWord[currSymbol];

                if (!mappedChars.ContainsKey(symbol))
                {
                    isExchangable = false;

                    break;
                }
            }

            for (int currSymbol = smallerLen; currSymbol < secondWord.Length; currSymbol++)
            {
                char symbol = secondWord[currSymbol];

                if (!mappedChars.ContainsValue(symbol))
                {
                    isExchangable = false;

                    break;
                }
            }

            Console.WriteLine(isExchangable ? "true" : "false");
        }
    }
}