#include<stdio.h>
#include<stdlib.h>

int main(){
    char  signal;
    signal[]={Red,Yellow,Green};
    if(signal[0]){
        printf("Stop");
        return 0;
    }
    elseif(signal[1]){
        printf("Ready");
        return 0;
    }
    else{
        printf("Go");
    }
    printf("Invalid input");
    return 0;
}