#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");
    }
    else if(traffic[0] == 'Y' && traffic[1] == 'e' && traffic[2] == 'l' && traffic[3] == 'l' && traffic[4] == 'o' && traffic[5] == 'w' && traffic[6] == '\0'){
        printf("Ready");
    }
    else if(traffic[0] == 'G' && traffic[1] == 'r' && traffic[2] == 'e' && traffic[3] == 'e' && traffic[4] == 'n' && traffic[5] == '\0');
        printf("Go");
    }
    else{
        printf("Invalid input");
    }