A0,B0,C0 = map(int,input().split("."))
A1,B1,C1 = map(int,input().split("."))
if A0 < A1:
    print("NO")
elif A0 > A1:
    print("YES")
else:
    if B0 < B1:
        print("NO")
    elif B0 > B1:
        print("YES")
    else:
        if C0 < C1:
            print("NO")
        else:
            print("YES")