#include <iostream>
#include <conio.h>
using namespace std;

int main(int argc, char** argv) {
	char ch;
	cout<<"Nhap vao 1 ky tu so: "; cin>>ch;
	switch (ch) {
		case '0':
			cout<<"Chu so khong";
			break;
		case '1':
			cout<<"Chu so mot";
			break;
		case '2':
			cout<<"Chu so hai";
			break;
		case '3':
			cout<<"Chu so ba";
			break;
		case '4':
			cout<<"Chu so bon";
			break;
		case '5':
			cout<<"Chu so nam";
			break;
		case '6':
			cout<<"Chu so sau";
			break;
		case '7':
			cout<<"Chu so bay";
			break;
		case '8':
			cout<<"Chu so tam";
			break;
		case '9':
			cout<<"Chu so chin";
			break;
		default:
			cout<<"Khong la chu so";
	}
	return 0;
}