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

int main(){
    char signal[10];
    
    scanf("%s", signal");
    
    if(strcmp(signal, "Red")==0){
        printf("Stop");
    }
    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;
}