export { }
const lines = [];
const reader = require('readline').createInterface({
  input: process.stdin,
  output: process.stdout
})

reader.on('line', (line) => {
  lines.push(line)
})
reader.on('close', () => {

  const colorList: string[] = lines

  const redList: string[] = colorList.filter((color: string): boolean => {
    return (color === 'red' || color === 'RED' )
  })

  if (redList.length >= 2) {
    console.log('RED')
  } else {
    console.log('BLUE')
  }
})