#include<bits/stdc++.h>
using namespace std;
int main()
{
    string a[]={"?","H","2B","3B","HR"};
    string b[5];
    for(int i=1;i<=4;i++) cin>>b[i];
    for(int i=1;i<=4;i++)
    {
        int cnt=0;
        for(int j=1;j<=4;j++) if(b[j]==a[i]) cnt++;      
        if(cnt!=1) 
        {
            cout<<"No";
            return 0;
        } 
    }
    cout<<"Yes";
    return 0;
}