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    Java Code:

        public static int gemstones(List<String> arr) {
        // Write your code here
        String alphabetsStr = "abcdefghijklmnopqrstuvwxyz";
        int count = alphabetsStr.length();
        
        for(Character c: alphabetsStr.toCharArray()){
            int flag=0;
            for(String s : arr){
                if(!s.contains(String.valueOf(c))){
                    flag=1;
                    break;
                }
            }
            if(flag==1)
                count--;
        }
        return count;
    
        }