#include<stdio.h>
#include<string.h>
int main(){
    Chat signal[20];
    scanf("%S\n",&signal);
    if(strcmp(signal,"Red")==0){
        printf("Stop");
    }
    else if(strcmp(signal,"Yellow")==0){
        printf("Ready");
    }
    else(strcmp(signal,"Red")==0){
        printf("Go");
    }