#include <stdio.h>
#include <string.h>
int main(){
    char[10];
    scanf("%s",s);
    if(strcmp(s,"Red")==0){
        printf("Stop");
    }
    else if(strcmp(s,"Yellow")==0){
        printf("Ready");
    }
    else if(strcmp(s,"Green")==0){
        printf("Go");
    }
    else{
        printf("Invalid input");
    }
    return 0;
}