Write a Python program to check whether a given 3-digit number is an Armstrong number (sum of cubes of digits equals the number).
A 3-digit integer N.
Print 'Armstrong' or 'Not Armstrong'.
100 <= N <= 999
153
Armstrong
For 153: 1^3 + 5^3 + 3^3 = 1 + 125 + 27 = 153.
# Write your code here
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