#include <stdio.h>

int main(){
    char str[] = "RGB";
    int arrnum,temp;
    scanf("%d",&arrnum);
    int arrlist[arrnum];
    for (int i = 0; i<arrnum; i+=1){
        scanf("%d",&arrlist[i]);
        printf("\n");
    }
    for (int i = 1; i<=arrnum; i+=1){
        if (i%2 == 0){
            temp = str[2];
            str[2] = str[1];
            str[1] = temp;
            printf("%s\n",str);
        }
        else{
            temp = str[0];
            str[0] = str[1];
            str[1] = temp;
            printf("%s\n",str);
        }
    }
    return 0;
}