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#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using pi = pair<int, int>;
using vpi = vector<pi>;
using vi = vector<int>;
using vll = vector<long long>;
using mpii = map<int, int>;
using mpll = map<ll, ll>;
using db = long double;
#define push_back pb
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define lb lower_bound
#define ub upper_bound
const int MOD = (int)1e9 + 7;
const db PI = acos((db)-1);
const int dx[4]{1, 0, -1, 0};
const int dy[4]{0, 1, 0, -1};
string solve() {
vi fq1(28), fq2(28);
string s1, s2, s3;
cin >> s1 >> s2 >> s3;
s1 += s2;
for (auto ch : s1) {
fq1[ch - 'A']++;
}
for (auto ch : s3) {
fq2[ch - 'A']++;
}
for (int i = 0; i < 28; i++) {
if (fq1[i] != fq2[i]) {
return "NO";
}
}
return "YES";
}
int main () {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout << solve() << '\n';
}
/* stuff you should look for:
---------------------------
* special cases (n=1?)
* int overflow, array bounds
* do smth instead of nothing and stay organized
* WRITE STUFF DOWN
* DON'T GET STUCK ON ONE APPROACH
*/
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