#include<stdio.h>

int main(){
    char traffic[30];
    scanf("%s",&traffic);
    if(traffic[0]=='R' && traffic[1]=='e' && traffic[2]=='d' && traffic[3]='\0'){
        printf("Stop",traffic);
    }
    else if(traffic[0]=='Y' && traffic[1]=='e' && traffic[2]=='l' && traffic[3]=='l' && traffic[4]=='o' && traffic[5]=='w' && traffic[5]=='\0'){
        printf("Ready",traffic);''
    }
    else if(traffic[0]=='G' && traffic[1]=='r' && traffic[2]=='e' && traffic[3]=='e' && traffic[4]=='n' && traffic[5]=='\0');
        printf("Go",traffic);
    }
    else{
        printf("Invalid input");
    }
    return 0;
}