With the development of computers, people have entered the network age, so the computer international summit will soon decide to hire them.

Class A is a high-level conference next to the summit, and class B conference papers are relatively easy to recruit ... Academic conferences in the computer field are divided into five levels: A+, A+, A, B, C, L ***5 *. Among them, Class A+ belongs to the top-level conference. Class A is a high-level meeting second only to the summit. It is relatively easy to recruit B-level conference papers. Of course, many meetings are made of hard paper. C and L meetings are relatively low-key, and papers are easy to publish, but the recognition is not high.