def main():
    major1, minor1, patch1 = map(int, input().split("."))
    major2, minor2, patch2 = map(int, input().split("."))

    if major1 > major2:
        print("YES")
    elif major2 > major1:
        print("NO")
    else:
        if minor1 > minor2:
            print("YES")
        elif minor2 > minor1:
            print("NO")
        else:
            if patch1 > patch2:
                print("YES")
            elif patch2 > patch1:
                print("NO")
            else:
                print("YES")


if __name__ == '__main__':
    main()