#include<stdio.h>
#include<string.h>
int main(){
    char s;
    scanf("%s",&s);
    if(strcmp(s,"Red")== 0){
        printf("Stop");
    }
    else if(s == "Yellow"){
        printf("Ready");
    }
    else if(s == "Green"){
        printf("Go");
    }
    else{
        printf("Invalid input");
    }
}