public static String[] findWords(String[] words) {

List<String> list = new ArrayList<String>();

char[][] arr = new char[26][2];

for (int i=0;i<26;i++){

arr[i][0] =(char)(97+i);

}

for (int i=0;i<26;i++){

if (arr[i][0]=='q'||arr[i][0]=='w'||arr[i][0]=='e'||arr[i][0]=='r'||arr[i][0]=='t'||arr[i][0]=='y'||arr[i][0]=='u'||arr[i][0]=='i'||arr[i][0]=='o'||arr[i][0]=='p'){

arr[i][1] = 'a';

}else if (arr[i][0]=='a'||arr[i][0]=='s'||arr[i][0]=='d'||arr[i][0]=='f'||arr[i][0]=='g'||arr[i][0]=='h'||arr[i][0]=='j'||arr[i][0]=='k'||arr[i][0]=='l'){

arr[i][1] = 'b';

}else {

arr[i][1] = 'c';

}

}

for (int i=0;i<words.length;i++){

String ss = words[i];

boolean flag = true;

String s = ss.toLowerCase();

char first = s.charAt(0);

char tem = arr[first-97][1];

for (int j=1;j<s.length();j++){

if (arr[s.charAt(j)-97][1]!=tem){

flag = false;

break;

}

}

if (flag){

list.add(ss);

}

}

return list.toArray(new String[list.size()]);

/*String[] res = new String[list.size()];

}

public static void main(String[] args) {

String[] start = {"adsdf","sfd"};

String[] end = KeyboardRow.findWords(start);

for (int i=0;i<end.length;i++){

System.out.println(end[i]);

}

}