#include <stdio.h>
#include <string.h>
int main() {
    
    char[10] s;
    
    scanf("%s", s);
    
    if (strcmp(s, "Red") == 0){
        printf("Stop");
    } else if (strcmp(s, "Yello") == 0) {
        printf("Ready");
    } else if (strcmp(s, "Green") == 0) {
        printf("Go");
    } else {
        printf("Invalid input");
    }
    return 0;
}