const fs = require('fs')

function main(input: string): void {
	const [a, b] = input.split('\n')
  const arrA = a.split('')
  const arrB = b.split('')
  arrA.sort()
  arrB.sort()
  const boolArr = arrA.map((a, idx) => {
    return a === arrB[idx]
  })

  if (boolArr.indexOf(false)) {
    console.log('NO')
  } else {
    console.log('YES')
  }
}

main(fs.readFileSync('/dev/stdin', 'utf8'))