// editor5
#include<stdio.h>
int main(){
    char signal[20];
    scanf("%s",signl);
    if(strcmp(signal,"Red")== 0){
        printf("Stop");
    }
    else if (strcmp(signal,"Yellow")== 0){
        printf("Ready");
    }
    else if (strcmp(signal,"Green")== 0){
        printf("Go");
    }
    else{
        printf("Invalid input");
    }
    return 0;
}