```
# prompt the user to enter the lengths of the sides of the triangle
a = float(input("Enter the length of side a: "))
b = float(input("Enter the length of side b: "))
c = float(input("Enter the length of side c: "))
# calculate the semiperimeter of the triangle
s = (a + b + c) / 2
# calculate the area of the triangle using the formula
area = (s*(s-a)*(s-b)*(s-c)) ** 0.5
# print the result
print("The area of the triangle is:", area)
```