let i = require('fs').readFileSync('/dev/stdin', 'utf8').split('\n')
let x = i[0].split('.').map((e) => parseInt(e))
let y = i[1].split('.').map((e) => parseInt(e))
for (let n in x) {
  if (x[n] > y[n]) {
    console.log('YES')
    break
  }
  if (x[n] < y[n]) {
    console.log('NO')
    break
  }
  if (n == 2) {
    console.log('YES')
  }
}