Ответ:

spisok = list(map(int, input().split()))

number1 = 0

number2 = 1

for one in range(len(spisok) - 1):

   for two in range(one + 1, len(spisok)):

       if abs(spisok[one] - spisok[two]) < abs(spisok[number1] - spisok[number2]):

           number1 = one

           number2 = two

print(number1, number2)