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

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

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

#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;
}