c++ very easy part 5 primary color code

  The program must accept a character C and print the output based on the following conditions.

    If C is r or R, the output must be RED
    If C is g or G, the output must be GREEN
    If C is b or B, the output must be BLUE
    If C is any other value, the output must be UNDEFINED

Input Format:
The first line denotes the value of C.

Output Format:
The first line contains the value based on the given conditions. (The output is CASE SENSITIVE).

Boundary Conditions:
C will be a single character.

Example Input/Output 1:
Input:
R

Output:
RED

Example Input/Output 2:
Input:
+

Output:
UNDEFINED

Example Input/Output 3:
Input:
Y

Output:
UNDEFINED

Code:
#include<bits/stdc++.h>

using namespace std;
int main()
{
char ch;
cin>>ch;
if(ch=='r' || ch=='R')
{
    cout<<"RED";
}
else if(ch=='g' || ch=='G')
{
    cout<<"GREEN";
}
else if(ch=='b' || ch=='B')
{
    cout<<"BLUE";
}
else
{
    cout<<"UNDEFINED";
}
return 0;
}