A0,B0,C0 = map(int,input().split("."))
A1,B1,C1 = map(int,input().split("."))

if A1 < A0:
    print("YES")
elif A1 == A0:
    if B1 < B0:
        print("YES")
    elif B1 == B0:
        if C1 < C0:
            print("YES")
        else:
            print("NO")
    else:
        print("NO")
else:
    print("NO")