Sanalista

#include <iostream>
 
using namespace std;
 
int t[1001];
 
int main () {
	int n;
	string s;
	cin >> n;
	int a = n;
	for (int i = 0; i < n; i++) {
		cin >> s;
		for (char c : s) {
			t[i] ^= (1<<c);
		}
		a -= (bool) t[i];
	}
	cout << a << "\n"; 
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED