#include<bits/stdc++.h>
using namespace std;
int main()
{
	char a,b,c,d;
	cin>>a>>b>>c>>d;
	if(a>b) swap(a,b);
	if(c>d) swap(c,d);
	if(b-a==d-c||b-a==5-(d-c))
	{
		cout<<"Yes";
	}
	else
	{
		cout<<"No";
	}
	return 0;
}