#include <cassert>
#include <iostream>
#include <algorithm>
#include <cstring>
 
using namespace std;
 
int Tn;
string s;
bool ok;
 
int main (int argc, char * const argv[]) {
	cin >> Tn;
	assert(1 <= Tn && Tn <= 100);
	while (Tn--) {
		cin >> s;
		for(int i = 0; i < s.length(); i++) {
			assert('A' <= s[i] && s[i] <= 'Z');
		}
		assert(2 <= s.length() && s.length() <= 100);
		bool ok = true;
		for(int i = 0; i < s.length(); i++)
			if (s[i] != s[i % 2]) {
				ok = false;
				break;
			}
		if (s[0] == s[1])
			ok = false;
		if (ok)
			cout << "YES" << endl;
		else
			cout << "NO" << endl;		
	}
    return 0;
}