#include<stdio.h>
#include<string.h>
int main(){
    char signal[10];
    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\n");
    }
    else{
        printf("Invalid in")
    }
}