import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String t = br.readLine();
		br.close();

		if (t.indexOf("SKG") == -1) {
			System.out.println("Yes");
			char[] s = t.toCharArray();
			for (int i = 0; i < s.length; i++) {
				if (s[i] == '.') {
					if (i == 0) {
						s[i] = 'G';
					} else {
						s[i] = s[i - 1];
					}
				}
			}
			System.out.println(s);
		} else {
			System.out.println("No");
		}
	}
}