#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
	string S;
	cin >> S;
	for (int i = 0; i < S.size(); i++) {
	  if (i > (S.size()-3)) {
	    goto IT;
	  }
		if ((S[i] == 'S') && (S[i+1] == 'K')) {
			if (S[i+2] == 'G') {
				std::cout << "No" << std::endl;
				return 0;
			}
		}
IT:
		if (S[i] == '.') {
			if (i < 2) {
				S[i] = 'G';
			}
			else {
				if ((S[i-2] == 'S') && (S[i-1] == 'K')) {
					S[i] = 'K';
				}
				else {
					S[i] = 'G';
				}
			}
		}
	}
	std::cout << "Yes" << std::endl;
	cout << S << endl;
	return 0;
}