#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

#define rd_init() char*rp=({char*mmap();mmap(0l,1l<<25,1,2,0,0ll);})

int a[128];

int main(){
	rd_init();
	for(int c;c=*rp++;){
		++a[c];
	}
	if(a['.']*a['#']&1){
		write(1,"No",2);
	}else{
		write(1,"Yes",3);
	}
	_exit(0);
}