a = input().split(".")
b = input().split(".")

def judge(a, b):
  if a[0] > b[0]:
    return 'YES'

  if a[0] >= b[0] and a[1] > b[1]:
    return 'YES'

  if a[0] >= b[0] and a[1] >= b[1] and a[2] >= b[2]:
    return 'YES'
  else:
    return 'NO'

print(judge(a,b))