#include <stdio.h>
#include <stdio.h>
int main(){
    char s[10];
    scanf("%s",s);
    if(strcmp(s,"red")==0){
        printf("stop");
    }
    else if(strcmp(s,"Green")==0{
        printf("ready");
    }
    else if(strcmp(s,"Yellow")==0{
        printf("Go");
    }
    else{
        printf("Invalid input");
    }
    returen 0;
    }