The task is to generate the correct answer for a given math problem.

Ex Input:
Problem: meena wrote all the numbers from 1 to 29,999 inclusive . how many digits did she write in total ?

Ex Output:
138,889


Ex Input:
Problem: excluding stoppages , the average speed of a bus is 60 km / hr and including stoppages , the average speed of the bus is 15 km / hr . for how many minutes does the bus stop per hour ?

Ex Output:
4


Ex Input:
Problem: if 6 women can color 180 m long cloth in 3 days , then 5 women can color 200 m long cloth in ?

Ex Output:

4 days