Write a Python program to calculate sum of digits of a number.

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num = int(input("Input a four digit numbers: "))
x  = num //1000
x1 = (num - x*1000)//100
x2 = (num - x*1000 - x1*100)//10
x3 = num - x*1000 - x1*100 - x2*10
print("The sum of digits in the number is", x+x1+x2+x3)