#include <stdio.h>
#include<string.h>

int main(void) {

	int n;
	int i;
	char s[10];
	int red1 = 0, orange1 = 0, yellow1 = 0, green1 = 0, cyan1 = 0, blue1 = 0, violet1 = 0;
	int red2 = 0, orange2 = 0, yellow2 = 0, green2 = 0, cyan2 = 0, blue2 = 0, violet2 = 0;

	scanf("%d", &n);
	for(i = 0;i < n;i++){
		scanf("%s", s);
		if(strcmp(s, "Red") == 0){
			red1++;
		}
		else	if(strcmp(s, "Orange") == 0){
			orange1++;
		}
		else	if(strcmp(s, "Yellow") == 0){
			yellow1++;
		}
		else	if(strcmp(s, "Green") == 0){
			green1++;
		}
		else	if(strcmp(s, "Cyan") == 0){
			cyan1++;
		}
		else	if(strcmp(s, "Blue") == 0){
			blue1++;
		}
		else	if(strcmp(s, "Violet") == 0){
			violet1++;
		}
	}
	for(i = 0;i < n - 1;i++){
		scanf("%s", s);
		if(strcmp(s, "Red") == 0){
			red2++;
		}
		else	if(strcmp(s, "Orange") == 0){
			orange2++;
		}
		else	if(strcmp(s, "Yellow") == 0){
			yellow2++;
		}
		else	if(strcmp(s, "Green") == 0){
			green2++;
		}
		else	if(strcmp(s, "Cyan") == 0){
			cyan2++;
		}
		else	if(strcmp(s, "Blue") == 0){
			blue2++;
		}
		else	if(strcmp(s, "Violet") == 0){
			violet2++;
		}
	}
	if(red1 != red2){
		printf("Red\n");
	}
	else if(orange1 != orange2){
		printf("Orange\n");
	}
	else if(yellow1 != yellow2){
		printf("Yellow\n");
	}
	else if(green1 != green2){
		printf("Green\n");
	}
	else if(cyan1 != cyan2){
		printf("Cyan\n");
	}
	else if(blue1 != blue2){
		printf("Blue\n");
	}
	else if(violet1 != violet2){
		printf("Violet\n");
	}

	return 0;
}