Look at the following program source code. When the program is run, the sum of the numbers are not printed out. Explain why this is so. (1)
num1 = input('What is your first number? ')
num2 = input('What is your second number? ')
num3 = input('What is your third number? ')
num4 = input('What is your fourth number? ')
num5 = input('What is your fifth number? ')
Sum = num1+num2+num3+num4+num5
print('The sum is: ', sum)