const fs = require('fs')

function main(input: string): void {
  const [one, two] = input.split('\n')
  const oneSorted = one.split('').sort().join('')
  const twoSorted = two.split('').sort().join('')

  const res = oneSorted === twoSorted
    ? 'YES'
    : 'NO'

  console.log(res)
}

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