a1,b1,c1 = map(int,input().split("."))
a2,b2,c2 = map(int,input().split("."))
if a2>a1:
    print("NO")
elif a2<a1:
    print("YES")
else:
    if b2>b1:
        print("NO")
    elif b2<b1:
        print("YES")
    else:
        if c2>c1:
            print("NO")
        else:
            print("YES")