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 colors: string[] = lines

  const sumOfRed: number = colors.reduce((sum: number, color: string): number => {
    if (color !== 'RED') return sum 
    return sum + 1
  }, 0)

  const result = (sumOfRed >= 2) ? 'RED' : 'BLUE'

  console.log(result)
  
})