#include <bits/stdc++.h>
#define PB push_back
#define MP make_pair
#define REP(i,n) for (int i=0;i<(n);i++)
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define ALL(a) (a).begin(),(a).end()
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> P;
const int INF=1e9;
int main(){
      string a,b;
      cin>>a>>b;
      int cnt1[26],cnt2[26];
      REP(i,26)cnt1[i]=cnt2[i]=0;
      REP(i,a.size())cnt1[a[i]-'a']++;
      REP(i,b.size())cnt2[b[i]-'a']++;
      bool ans=true;
      REP(i,26)if(cnt1[i]!=cnt2[i])ans=false;
      if(ans)cout<<"YES"<<endl;
      else cout<<"NO"<<endl;
}