#include <stdio.h>
int main() 
{
char n[50];
fgets(n,sizeof(n),stdin);
if(strcmp(n,"green")==0)
{
    printf("GOO!");
}
else if(strcmp(n,"yellow")==0)
{
    printf("READYYY!");
}
else if(strcmp(n,"red")==0)
{
    printf("STOP!");
}
else
{
    printf("Invalid input");
}
return 0;
}