isomorphic.java

import java.io.*; 
import java.util.*; 
class isomorphic 
{ 
    static int size = 256; 
      
    static boolean areIsomorphic(String str1, String str2) 
    { 
        int m = str1.length(); 
        int n = str2.length(); 
          
        if(m != n) 
            return false; 
              
        Boolean[] marked = new Boolean[size]; 
        Arrays.fill(marked, Boolean.FALSE); 
          
        int[] map = new int[size]; 
        Arrays.fill(map, -1); 
          
        for (int i = 0; i < n; i++) 
        { 
            if (map[str1.charAt(i)] == -1) 
            { 
                if (marked[str2.charAt(i)] == true) 
                    return false; 
  
                marked[str2.charAt(i)] = true; 
  
                map[str1.charAt(i)] = str2.charAt(i); 
            } 
  
            else if (map[str1.charAt(i)] != str2.charAt(i)) 
            return false; 
        } 
  
        return true; 
    } 
    public static void main (String[] args)  
    {   
	Scanner kb = new Scanner(System.in);
	String str1=kb.next();
	String str2=kb.next();
        boolean res = areIsomorphic(str1,str2); 
        String name=(res==true)?"yes":"no";
	System.out.println(name); 
      
    } 
}