Complete the countSmileys() method that should return the total number of smiling faces.

Rules for a smiling face:

1. Each smiley face must contain a valid pair of eyes. Eyes can be marked as : or ;
2. A smiley face can have a nose, but it does not have to. Valid characters for a nose are - or ~
3. Every smiling face must have a smiling mouth that should be marked with either ) or D
4. No additional characters are allowed except for those mentioned.

Valid smiley face examples: :) :D ;-D :~) Invalid smiley faces: ;( :> :} :]

Example:
countSmileys([':)', ';(', ';}', ':-D']); // should return 2;
countSmileys([';D', ':-(', ':-)', ';~)']); // should return 3;
countSmileys([';]', ':[', ';*', ':$', ';-D']); // should return 1;

Note: In case of an empty array return 0. Order of the face (eyes, nose, mouth) elements will always be the same.