/*
#include <stdio.h>
int main()
{
int i,n,j,k,f;
char a[100];
scanf("%s", a);
if(strlen(a) == 3)
{
if(a[0] == 'I' && a[1] == 'O' && a[2] == 'I')
{
printf("IOI is the International Olympiad in Informatics.");
}
else
{
printf("I don't care.");
}
}
else
{
printf("I don't care.");
}
}
*/
/*
#include <stdio.h>
int main()
{
int i,n,j,k,f,g;
char a[100];
scanf("%s" , a);
printf("welcome! ");
for(i = 0 ; i < strlen(a) ; i++)
{
printf("%c" , a[i]);
}
}
*/
/*
#include <stdio.h>
int main()
{
int i,n = 0,j,k,g,h;
char a[1000];
scanf("%s", a);
for(i = 0 ; i < strlen(a) ; i++)
{
n += a[i];
}
if(n % 3 == 0)
{
printf("1");
}
else
{
printf("0");
}
}
*/
#include <stdio.h>
int main()
{
int i,n,j,k,h;
char S1[100] , S2[100] , S3[100];
scanf("%s" , S1);
scanf("%s" , S2);
scanf("%s" , S3);
if(S1[strlen(S1+1)] == S2[0] && S2[strlen(S2+1)] == S3[0] && S3[strlen(S3+1)] == S1[0])
{
printf("good");
}
else
{
printf("bad");
}
}