struct inf
{
	int sum;
	char write[1000][4];
};
int main()
{   
	int m;
	int i,j;
	char name[5];
	char author[27];
	struct inf book[26];
	for(i=0;i<26;i++)
		book[i].sum=0;

	cin >> m ;
	cin.get();

	while( m -->0 )
	{
		cin.get( name,5);
		cin.getline( author,27);
		for(i=0;i <strlen(author);i++)
		{
			book[author[i]-'A'].sum++;
			for( j=0;j<=3;j++)
			{
				if(j<3)
				book[author[i]-'A'].write[book[author[i]-'A'].sum][j] = name[j];
				else
					book[author[i]-'A'].write[book[author[i]-'A'].sum][j]='\0';
			}
		}
	}


	int max=0,t;
	for(i=0;i<26;i++)
	{
		if(book[i].sum>max)
		{
			t=i;
			max = book[i].sum;
		}

	}

	cout << (char)(t+'A')  << endl << book[t].sum << endl;
	for( i=1;i<=book[t].sum;i++)
		cout << book[t].write[i] << endl;
	return 0;
}

