static boolean isAnagram(String a, String b) {
        // Complete the function
        a = a.toLowerCase();
        b = b.toLowerCase();
        if(a.length() != b.length()) return false;
        char[] ch1 = a.toCharArray();
        char[] ch2 = b.toCharArray();
        int[] freq1 = new int[26];
        int[] freq2 = new int[26];
        for(int i=0;i<ch1.length;i++){
            freq1[ch1[i]-'a']++;
        }
        for(int i=0;i<ch2.length;i++){
            freq2[ch2[i]-'a']++;
        }
        
        for(int i=0;i<freq1.length;i++){
            if(freq1[i]!= freq2[i]){
                return false;
            }
        }
        
        return true;
    }