function Main(input) {
  let data = input.split("\n");
  // let data = input.split(" ");
  let A = data[0];
  let B = data[1];
  // let  = Number(data[0]);
  // let  = Number(data[1]);

  let arrayA = A.split('');
  arrayA = arrayA.sort();
  let arrayB = B.split('');
  arrayB = arrayB.sort();

  if (arrayA === arrayB) {
    console.log('YES');
  } else {
    console.log('NO');
  }

}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));