#include <iostream>
using namespace std;
 
int main() {
	// your code goes here
	string a,b,c;
	cin>>a>>b>>c;
	int s[26]={0};
	for(int i=0;i<a.length();i++)
	{
		s[a[i]-'A']++;
	}
	for(int i=0;i<b.length();i++)
	{
		s[b[i]-'A']++;
	}
	int f=0;
	if(a.length()+b.length()!=c.length()) f=1;
	else
	{for(int i=0;i<c.length();i++)
	{
		s[c[i]-'A']--;
		if(s[c[i]-'A']<0)
		{
			f=1;
			break;
		}
	}}
	if(f==0) cout<<"YES";
	else cout<<"NO";
	return 0;
}

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