Python 3.4 (нет под рукой 3.3)n=int(input("Введите N: "))s=''for i in range(-n,0): s=s+str(-i)+' 'print(s)
Тестовое решение:Python 3.4.2 (v3.4.2:ab2c023a9432, Oct 6 2014, 22:15:05) [MSC v.1600 32 bit (Intel)] on win32Type "copyright", "credits" or "license()" for more information.>>> ================================ RESTART ================================>>> Введите N: 55 4 3 2 1