'use strict'

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

function doMain () {
  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)
  })
}

doMain()
