#include<iostream>
#include<cmath>
#include<cstdlib>
#include<cstdio>
using namespace std;

char a,b;

int main()
{
	a=getchar();
	b=getchar();
	if(((int)a+(int)b-96-96)%10==0)
		cout<<"Yes"<<endl;
	else
		cout<<"No"<<endl;
	system("pause");
	return 0;
}