#include <stdio.h>
#include <string.h>
int main(void) {
    char s[100];
    
    if (scanf("%99s , s") != 1) {
        printf("Invalid input");
        return 0;
    }
    if(strcmp(s, "Red") == 0) {
        printf("stop");
    } else if(strcmp(s, "yellow") ==0) {
        printf("Ready");
    } else if (strcmp(s, "Green") ==0) {
        printf("Go");
    } else {
        printf("Invalid input");
    }
    return 0;
}