#include <stdio.h>
#include <string.h>

int main(){
    char signal[10];
    
    printf("Red", "Yellow", "Green");
    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 input\n");
    }
     return 0;        
}