#include <iostream>
void aaa(int *a,int start,int end){
  if(start<end){
	for(int i=start;i<end; i++){
      if(a[i]>a[i+1]){
        int tmp=a[i];
        a[i]=a[i+1];
        a[i+1]=tmp;
      }
    }
    aaa(a,start,end-1);
  }
}

int main(void){
  int suma=0;
  int sumb=0;
  int xa[10],xb[10];
  
  std::string a;
  std::string b;

  std::cin >> a >> b;
  
  const char* ca = a.c_str();
  const char* cb = b.c_str();

  for(int i=0;i<a.length();i++){
    xa[i]=(int)ca[i];
  }
  for(int i=0;i<b.length();i++){
    xb[i]=(int)cb[i];
  }
  
  aaa(xa,0,a.length());
  aaa(xb,0,b.length());
  /*
  for(int i=0;i<a.length();i++){
    std::cout << (char)xa[i] <<',';
  }
  for(int i=0;i<a.length();i++){
    std::cout << (char)xb[i] <<',';
  }
  */
  int j=0;
  for(int i=0;i<a.length();i++){
    if(xa[i]!=xb[i]){
      std::cout << "NO" <<std::endl;
      break;
    }
    else{
      j++;
    }
  }
  if(j==a.length())std::cout << "YES" <<std::endl;
}