#include <bits/stdc++.h>
// #include <atcoder/all>
using namespace std;
// using namespace atcoder;
#define rep(i, a, n) for(int i = a; i < n; i++)
#define rrep(i, a, n) for(int i = a; i >= n; i--)
#define inr(l, x, r) (l <= x && x < r)
#define ll long long
#define ld long double

// using mint = modint1000000007;
// using mint = modint998244353;
constexpr int IINF = 1001001001;
constexpr ll INF = 1e18;

template<class t,class u> void chmax(t&a,u b){if(a<b)a=b;}
template<class t,class u> void chmin(t&a,u b){if(b<a)a=b;}

int main(){
    string s; cin >> s;
    int n = (int)s.size();
    rep(i, 0, n-2){
        if(s.substr(i, 3) == "SKG"){
            cout << "No" << endl;
            return 0;
        }
    }
    rep(i, 0, n){
        if(s[i] != '.') break;
        s[i] = 'G';
    }
    rrep(i, n-1, 0){
        if(s[i] != '.') break;
        s[i] = 'S';
    }

    for(int i = 0; i < n; ){
        if(s[i] == '.'){
            int j = i;
            while(j < n && s[j] == '.') j++;
            if(j-i >= 2){
                rep(k, i, j-1) s[k] = 'S';
                s[j-1] = 'G';
            }else{
                if(s[i-1] == 'K' || s[i+1] == 'K') s[i] = 'K';
                else s[i] = 'G'; 
            }
            i = j;
        }else{
            i++;
        }
    }
    cout << "Yes" << endl;
    cout << s << endl;
    
    return 0;
}