# include <stdio.h>

void main(void){
	char letter;

	printf("Please enter color: ");
	scanf("%c",&letter);

	switch (letter){
	case 'o': case 'O':
		printf(" Chemical is ammonia\n");
		break;

	case 'b': case 'B':
		printf(" Chemical is carbon monoxide\n");
		break;
	case 'y': case 'Y':
		printf(" Chemical is hydrogen\n");
		break;
	case 'g': case 'G':
		printf(" Chemical is oxygen\n");
		break;
	default:
		printf(" Chemical not found\n");
	}

}