function main (input) {
  let x = Number(input[0])
  if (x < 1200) {
    console.log('ABC')
  } else {
    console.log('ARC')
  }
}

let input = ''

process.stdin.resume()
process.stdin.setEncoding('utf8')
process.stdin.on('data', (chunk) => {
  input += chunk
})
process.stdin.on('end', () => {
  input = input.trim().split('\n')
  main(input)
})
