Working Day Group

Source: Phước Hưng OJ

Version: Phuoc Hung OJ Extended

Problem Statement

An integer d encodes a weekday from 1 through 7. Codes 1–5 are working days, 6 and 7 are rest days. Other codes are invalid.

Input

One integer d.

Output

Print WORK for d=1..5, REST for d=6 or 7, and INVALID otherwise.

Subtasks

• Subtask 1 (20%): 1 <= d <= 5.
• Subtask 2 (30%): 1 <= d <= 7.
• Subtask 3 (50%): -1000 <= d <= 1000.

Examples

Example 1

Input

6

Output

REST

Explanation

Code 6 denotes a day off.

Example 2

Input

0

Output

INVALID

Explanation

Code 0 is not a valid weekday code.