#include <stdio.h>

int main() {
    
    char[10] s;
    
    scanf(" %s", &s);
    
    if (s == "Red"){
        printf("Stop");
    } else if (s == "Yello") {
        printf("Ready");
    } else if (s == "Green") {
        printf("Go");
    } else {
        printf("Invalid input");
    }
    return 0;
}