'''Question: 
 Write a Python program to calculate the sum of the digits in an integer.
'''

# Python code: 

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)



'''Output sample: 
Input a four digit numbers: 5245                                                                              

The sum of digits in the number is 16

'''