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.

Constraints

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

Input

Input is given from Standard Input in the following format:

$S$

Output

Print the answer.

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