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A.cpp
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A.cpp
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#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
#define lb lower_bound
#define ub upper_bound
#define ff first
#define ss second
#define rep(i, a, b) for(int i = a; i < b; i++)
#define repR(i, a, b) for (int i = a; i >= b; --i)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) (int)(x).size()
#define mem1(a) memset(a,-1,sizeof(a))
#define mem0(a) memset(a,0,sizeof(a))
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define vi vector<int>
#define vvi vector<vi>
#define vll vector<ll>
#define vvll vector<vll>
#define vs vector<string>
#define vb vector<bool>
#define vpii vector<pii>
#define vpll vector<pll>
#define mod 1000000007
#define ps(x,y) fixed << setprecision(y) << x
#define fastio ios_base::sync_with_stdio(false),cin.tie(NULL),cout.tie(NULL)
bool check(string s)
{
stack<char> stk;
rep(i, 0, sz(s)) {
if (stk.empty() || s[i] == '(' || (s[i] == ')' && stk.top() != '(')) {
stk.push(s[i]);
}
else {
stk.pop();
}
}
if (stk.empty()) return true;
return false;
}
void solve()
{
string s;
cin >> s;
int n = sz(s);
if (s[0] == s[n - 1]) {
cout << "NO" << '\n';
return;
}
char c1 = s[0], c2 = s[n - 1];
for (auto &it : s) {
if (it == c1) it = '(';
if (it == c2) it = ')';
}
string t1 = s, t2 = s;
rep(i, 0, n) {
if (t1[i] >= 'A' && t1[i] <= 'C') t1[i] = '(';
if (t2[i] >= 'A' && t2[i] <= 'C') t2[i] = ')';
}
if (check(t1) || check(t2)) cout << "YES" << '\n';
else cout << "NO" << '\n';
}
int main()
{
fastio;
/*#ifndef ONLINE_JUDGE
freopen("input.txt","r",stdin);
freopen("output.txt","w",stdout);
#endif*/
int t = 1;
cin >> t;
while (t--) solve();
return 0;
}