Source

This problem is proposed by Long Long OJ and . All rights reserved.

Problem Background

Can't remember problem numbers? You need a problem ID generator.

Problem Description

Create a problem ID generator. The first line is either CF or AT:

The second line contains an integer $id$ and a letter $ch$.

• If the first line is CF, output the concatenation of CF, $id$, and $ch$;
• If the first line is AT, output the concatenation of AT, $id$, Contest_, and $ch$.

Input Format

The first line contains a string $op$.

The second line contains an integer $id$ and a letter $ch$.

Output Format

See the problem description.

CF
1 A

CF1A

AT
1 A

AT1Contest_A

Data Range

For $100\%$ of the data:

• $op \in \{\texttt{CF}, \texttt{AT}\}$,
• $id \in \{\texttt{1}, \texttt{2}, \ldots, \texttt{99}\}$,
• $ch \in \{\texttt{A}, \texttt{B}, \ldots, \texttt{Z}\}$.