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public class Solution {
    public String[] findWords(String[] words) {
        
        List<String> ans = new ArrayList<>();       // ******
             
        for ( String s : words){                    // **** for each loop on String[] 
            if (check("qwertyuiop", s) || check("asdfghjkl", s) || check("zxcvbnm", s)) {
               ans.add(s);
            }
        }
        return ans.toArray(new String[0]);          // convert list<String> to String[]
    }
    
    public boolean check(String keyboardStr, String str){

        str = str.toLowerCase();                    // convert string to lower case
        for ( char c : str.toCharArray()){          // for each loop for every characher in a string ** 
            if ( keyboardStr.indexOf(c) == -1){     // check if a char is present in a string  ** 
                return false;
            }
        }
        return true;    
    }
    
}