a0=[int(i) for i in input().split(".")]
a1=[int(i) for i in input().split(".")]
if a0[0]<a1[0]:
    print ("YES")
elif a0[0]>a1[0]:
    print ("NO")
elif a0[1]<a1[1]:
    print ("YES")
elif a0[1]>a1[1]:
    print ("NO")
elif a0[2]<a1[2]:
    print ("YES")
elif a0[2]>a1[2]:
    print ("NO")
else:
    print ("YES")