针对给定的两个数，计算它们的和以及差，并将结果打印出来。
num1 = 10
num2 = 5
# TODO: add code to calculate sum and difference
```
num1 = 10
num2 = 5

sum = num1 + num2
diff = num1 - num2

print("Sum:", sum)
print("Difference:", diff)
```