Code python:

$\color{green}{\text{Chúc bạn học tốt}}$

$#doanthevu$

Code C++:

#include <bits/stdc++.h>
#define ll long long 
using namespace std;
int main() {
    ll a, b, c;
    cin >> a >> b >> c;
    if (a + b <= c || a + c <= b || b + c <= a) 
    {
        cout << "-1" << endl;
        return 0;
    }
    if (a == b && b == c) {
        cout << "DEU" << endl;
    } else 
    if (a == b || a == c || b == c) {
        if (pow(a, 2) + pow(b, 2) == pow(c, 2) || pow(a, 2) + pow(c, 2) == pow(b, 2) || pow(b, 2) + pow(c, 2) == pow(a, 2)) {
            cout << "VUONG CAN" << endl;
        } else {
            cout << "CAN" << endl;
        }
    } else 
    if (pow(a, 2) + pow(b, 2) == pow(c, 2) || pow(a, 2) + pow(c, 2) == pow(b, 2) || pow(b, 2) + pow(c, 2) == pow(a, 2)) {
        cout << "VUONG" << endl;
    } else 
        cout << "THUONG" << endl;
    return 0;
}