#include<Studio.h>

int main()
{
    char s[20];
    scanf("%s",&s);
    if(s[0]=='R'&&s[1]=='e'&&s[2]=='d'&&s[3]=='\0'){
        printf("Stop");
    }
    else if(s[0]=='Y'&&s[1]=='e'&&s[2]=='l'&&s[3]=='l'&&s[4]=='o'&&s[5]=='w'&&s[6]=='\n'){
        printf("Ready");
    }
    else if(s[0]=='G'&&s[1]=='r'&&s[2]=='e'&&s[3]=='e'&&s[4]=='n'&&s[5]=='\0'){
        printf("Go");
    }
    else{
        printf("Invalid input");
    }
}