#include<stdio.h>
int main()
{
    int n;
    scanf("%d",&n);
    if(red)
    {
        printf("stop");
    }
    else if(yellow)
    {
        printf("ready");
    }
    else if (green)
    {
        printf("go");
    }
    else
    {
        printf("invalid input");
    }
}