function main(input) {
  const inputs =input.split('\n')
  const [S] = inputs[0].split(' ')
  let s = ''
  for(let i = 0; i < S.length; i++) {
    s += 'x'
  }
  console.log(s)
}

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