#include <stdio.h>
#include <string.h>
int main(){
    char signal[20];
    scanf("%s",signal);
    if(strcmp(signal,"Red")==0){
        printf("stop\n");
    }else if(strcmp(signal,"Yellow")==0){
        printf("ready\n");
    }else if(strcmp(signal,"Green")==0){
        printf("Go\m");
    }else{
        printf("Invalid input\n");
    }
    return 0;
}