题解 | 好串

#include <iostream>
using namespace std;

int main() {
    string s;
    cin>>s;
    int a_num=0,b_num=0;
    for(auto it:s){
        if(it=='a')a_num++;
        else if(it=='b')b_num++;
        if(a_num<b_num){cout<<"Bad"<<endl;return 0;}
    }
    if(a_num==b_num)cout<<"Good"<<endl;
    else cout<<"Bad"<<endl;
    return 0;
}