//Write your code here
#include<iostream>
#include<fstream>
#include<string>
#include<vector>
using namespace std;
int main(){
	char format[]="%[^:]: %d %d %d";
	char option[]="%s %s";
	char g;
	vector<string> name;
	vector<int> total;
	vector<char> grade;
	int a,b,c;
	int count=0;
	ifstream score;
	string text;
	score.open("name_score.txt");
	while(getline(score,text)){
		const char * t = text.c_str();
		char n[100];
		sscanf(t,format,n,&a,&b,&c);
		name.push_back(n);
		total.push_back(a+b+c);
		if(a+b+c>=80)g='A';
		else if(a+b+c>=70)g='B';
		else if(a+b+c>=60)g='C';
		else if(a+b+c>=50)g='D';
		else{g='F';}
		grade.push_back(g);
		count ++;
	}
	score.close();
	string sinput="abc";
	char search[100],data[100];
	while(sinput!="exit"){
		char search[100]="invalid";
		string ssearch="invalid";
		int presence=0;
		cout<<"Please input your command :";
		getline(cin,sinput);
		const char * input = sinput.c_str();
		for(int i=0;i<sinput.size();i++)sinput[i]=tolower(sinput[i]);
		if(sinput!="exit"){
			sscanf(input,option,search,data);
			ssearch=search;
			string sdata=data;
			sdata[0]=toupper(sdata[0]);
			for(int i=1;i<sdata.size();i++)sdata[i]=tolower(sdata[i]);
			for(int i=0;i<ssearch.size();i++)ssearch[i]=tolower(ssearch[i]);
			if(ssearch=="name"){
				for(int i=0;i<count;i++){
					if(name[i]==sdata){
						cout<<name[i]<<"'s grade = "<<grade[i]<<"\n";
						presence=1;
					}
				}
				if(presence==0)cout<<"Cannot found.\n";
				cout<<"---------------------------------\n";
			}
			else if(ssearch=="grade"){
				for(int i=0;i<count;i++){
					if(grade[i]==sdata[0]){
						cout<<name[i]<<"\n";
						presence=1;
					}
				}
				if(presence==0)cout<<"Cannot found.\n";
				cout<<"---------------------------------\n";
			}else{
				cout<<"Invalid command\n";
			}
		}
	}
	return 0;
}