#include<stdio.h>

int main(){
    char traffic[50];
    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[3]=="o" && traffic[4]=="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;
}