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

int main()
{
    int n;
    char row[51];
    while(scanf("%d %s",&n,&row)!=EOF)
    {
        int good=1;
        for (size_t i = 0; i < n; i++)
        {
            if(row[i]!=row[strlen(row)-n+i])
                good=0;
        }
        if(good==1)
            printf("Good\n");
        else
            printf("Bad\n");
    }
    return 0;
}