Problem Statement

You are given a string S ending with er or ist.
If S ends with er, print er; if it ends with ist, print ist.

Input

Input is given from Standard Input in the following format:
S

Output

Print the answer.

Constraints

• $2 \le |S| \le 20$
• S consists of lowercase English letters.
• S ends with er or ist.

Sample Input 1

atcoder

Sample Output 1

er

S="atcoder" ends with er.

Sample Input 2

tourist

Sample Output 2

ist

Sample Input 3

er

Sample Output 3

er

见题面 Input 部分

见题面 Output 部分