// editor3
#include<stdio.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") ==o){
        printf("Go\n");
    }else{
        printf("Invalid input\n");
    }
    return 0;
}