Directions: Read the following information carefully and answer the following questions:

Mohan is going to his school from his home by bike. First, he goes 4 km in the south direction then after turning to his left he goes 3 km and stops at a shop, then again he starts and turns to his left and goes 6 km. In the end, he turns to his right and goes 8 km to reach the school. What is the shortest distance between shop and school?