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

int main () {
    char singal[10];
    
    scanf("%s", signal);
    
    if(strcmp(singal, "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;
}