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