#include <stdio.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]=='\0' ){
        printf("Ready");
    }
    else if(s[0]=='G' && s[1]=='r' && s[2]=='e' && s[3]=='e' && s[4]=='n' && s[5]=='\0' ){
        print("Go");
    }
    else{
        printf("Invalid input");
    
    }
}