Description

Input an integer n (guaranteed to be between 0 and 25), representing a person's age.
If n is in the range of 0 to 3, output "infant".
If n is in the range of 4 to 12, output "child".
If n is in the range of 13 to 18, output "youngster".
If n is in the range of 19 to 25, output "youth".

Input Format

A single integer (between 0 and 25).

Output Format

An English word as described in the problem statement.

Sample

3

infant