#include<stdio.h>
int main(){
    char a[20]="Red";
    char b[20]="Yellow";
    char c[20]="Green";
    char signal[20];
    scanf("%s",signal);
    if(char signal =="Red"){
        printf("Stop");
    }
    else if(signal=="Yellow"){
        printf("Ready");
    }
    else if(signal=="Green"){
        printf("Go");
    }
    
    
    
    return 0;
}