What is the output of the following program:

Difficulty level
This exercise is mostly suitable for students 
#include <stdio.h>

enum colors {black = -1, white = 7, blue, red, cian, green, orange};

void main(){
	printf("black:  %d\n", black);
	printf("white: %d\n", white);
	printf("blue:   %d\n", blue);
	printf("red:   %d\n", red);
}


/*
output
black:  -1
white: 7
blue:   8
red:   9
*/
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