Isomorphic Strings 9

import java.io.*;
import java.util.*;

public class Solution {
    public static boolean isIso(String str1 , String str2){
        HashMap<Character,Character>map= new HashMap<>();
        char c = 'a';
        for(int i = 0 ; i < str1.length() ; i++){
            if(map.containsKey(str1.charAt(i))){
                 c = map.get(str1.charAt(i));
                if (c != str2.charAt(i))
                    return false;
            }else if (!map.containsValue(str2.charAt(i))) {
                map.put(str1.charAt(i),str2.charAt(i));
            } else {
                return false;
            }
        }
        return true;
        
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str1 = sc.nextLine();
        String str2 = sc.nextLine();
        if(str1.length() == str2.length() && isIso(str1,str2)){
            System.out.println("true");
        }else{
            System.out.println("false");
        }
    }
}