#pragma GCC diagnostic ignored "-Wimplicit-function-declaration"
#pragma GCC diagnostic ignored "-Wbuiltin-declaration-mismatch"
#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

#define rep(v,e) for(typeof(e)v=0;v<e;++v)

char buf[4+(1<<18)];

int main(){
	buf[0]='Y';
	buf[1]='e';
	buf[2]='s';
	buf[3]='\n';
	int n=read(0,buf+4,1<<18);
	int a=0;
	rep(i,n-1){
		int c=buf[4+i];
		if(c=='S'){
			a=1;
		}else if(c=='.'){
			buf[4+i]=a==1?'G':'K';
			a=0;
		}else if(c=='K'){
			a=a==1?2:0;
		}else{
			if(a==2){
				write(1,"No\n",3);
				_exit(0);
			}
			a=0;
		}
	}
	write(1,buf,4+n);
	_exit(0);
}