static void Main(string[] args)
{
string name1 = Console.ReadLine();
string name2 = Console.ReadLine();
string letters = Console.ReadLine();
string abc = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
int[] lettersNames = new int[26];
foreach (char n in name1)
lettersNames[abc.IndexOf(n.ToString())]++;
foreach (char n in name2)
lettersNames[abc.IndexOf(n.ToString())]++;
foreach (char l in letters)
lettersNames[abc.IndexOf(l.ToString())]--;
int sum = lettersNames.Select(x => Math.Abs(x)).Sum();
Console.WriteLine(sum == 0 ? "YES" : "NO");
Console.ReadLine();
}