t0 = str(input())
t1 = str(input())
a = t0.split(".")
b = t1.split(".")
flag = False
if b[0] <= a[0]:
  flag = True
  print("NO")

if b[1] <= a[1] and flag == False:
  flag = True
  print("NO")

if b[2] <= a[2] and flag == False:
  flag = True
  print("NO")

if flag == False:
  print("YES")