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