Shenshen's Life

Problem Description

Shenshen is a boy who understands life very well. He pairs each of the 7 days of the week with a different color scheme; from Sunday to Saturday the colors are in this order: red, orange, yellow, green, indigo, blue, violet.

Now write a program that, given the day of the week as input, outputs the color scheme Shenshen should wear that day.

Input Format

An integer $n\ (1 \le n \le 10^9)$ representing the day of the week.

Output Format

If $1 \le n \le 7$, output a lowercase English string representing the corresponding color scheme;

Otherwise, output error.

Sample Input 1

1

Sample Output 1

orange

Sample Input 2

7

Sample Output 2

red

Sample Input 3

10000

Sample Output 3

error

Hint

• Reread the statement: for $1$–$7$ output the corresponding color, and for everything else output error — do not take the remainder, do not wrap around; just use a magnitude comparison.
• List the seven color correspondences as a table before writing code (the statement gives the mapping).
• $n$ can be as large as $10^9$, which fits in an int.
• Verify with the samples: 1 → orange; 10000 → error.