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("No");
			return;
		}

		char[] s = t.toCharArray();
		for (int i = 0; i < s.length; i++) {
			if (s[i] == '.') {
				s[i] = 'G';
				boolean ok = true;
				for (int j = Math.max(i - 2, 0); j <= Math.min(i, s.length - 3); j++) {
					if (s[j] == 'S' && s[j + 1] == 'K' && s[j + 2] == 'G') {
						ok = false;
						break;
					}
				}
				if (ok) {
					continue;
				}

				s[i] = 'K';
				ok = true;
				for (int j = Math.max(i - 2, 0); j <= Math.min(i, s.length - 3); j++) {
					if (s[j] == 'S' && s[j + 1] == 'K' && s[j + 2] == 'G') {
						ok = false;
						break;
					}
				}
				if (ok) {
					continue;
				}

				s[i] = 'S';
				ok = true;
				for (int j = Math.max(i - 2, 0); j <= Math.min(i, s.length - 3); j++) {
					if (s[j] == 'S' && s[j + 1] == 'K' && s[j + 2] == 'G') {
						ok = false;
						break;
					}
				}
				if (ok) {
					continue;
				}

				System.out.println("No");
				return;
			}
		}
		System.out.println("Yes");
		System.out.println(s);
	}
}