#include <iostream>

 #include <string>

 using namespace std;

 bool flg;

 int n;

 char str[][];

 bool used[];

 void dfs(int p)

 {

     int i;

     if (p >=n || flg) return;

     if (str[p][] == 'm')

     {

         flg = true;

         return;

     }

     for (i=; i<n; i++)

         if (!used[i] && str[i][] == str[p][])

         {

             used[i] = true;

             dfs(i);

             used[i] = false;

         }

 }

 int main()

 {

     int i;

     string tmp;//="12345";

     //cout<<tmp.back()<<endl;

     while (cin>>tmp && tmp[] != '')

     {

         i=;

         flg = false;

         memset(used, false, sizeof(used));

         str[i][] = tmp[];

         str[i++][] = tmp[tmp.length()-];

         while (cin>>tmp && tmp[] != '')

         {

             str[i][] = tmp[];

             str[i++][] = tmp[tmp.length()-];

         }

         n = i;

         for (i=; i<n; i++)

             if (!flg && str[i][] == 'b')

             {

                 used[i] = true;

                 dfs(i);

                 used[i] = false;

             }

             if (flg)

                 cout<<"Yes."<<endl;

             else cout<<"No."<<endl;

     }

 }