/* -*- coding: utf-8 -*-
 *
 * 3526.cc:  No.3526 Anti SKG - yukicoder
 */

#include<cstdio>
#include<cstring>
#include<algorithm>

using namespace std;

/* constant */

const int MAX_N = 200000;

/* typedef */

/* global variables */

char t[MAX_N + 4];

/* subroutines */

/* main */

int main() {
  scanf("%s", t);
  int n = strlen(t);

  for (int i = 0; i + 3 <= n; i++)
    if (t[i] == 'S' && t[i + 1] == 'K' && t[i + 2] == 'G') {
      puts("No");
      return 0;
    }

  for (int i = 0; i < n; i++) {
    if (t[i] == '.') {
      if (i < 2 || t[i - 2] != 'S' || t[i - 1] != 'K')
	t[i] = 'G';
      else if (i < 1 || i + 1 >= n || t[i - 1] != 'S' || t[i + 1] != 'G')
	t[i] = 'K';
      else
	t[i] = 'S';
    }
  }
      
  puts("Yes");
  puts(t);
  
  return 0;
}