解法：

看字符串首元素即可

#include<iostream>
#include<vector>
#include<string>
#include<sstream>
using namespace std;
#define endl '\n'
void solve() {
	cin >> ws;
	string s, str;
	getline(cin, s);
	stringstream ss(s);
	while (ss >> str) {
		if (str[0] >= 'a' && str[0] <= 'z') {
			continue;
		}
		else {
			int flag = 0;
			for (int i = 0; i < str.size(); i++) {
				if (str[i] >= 'a' && str[i] <= 'z') {
					flag = 1;
					break;
				}
			}
			if (flag) {
				cout << str[0];
			}
			else {
				cout << str;
			}
		}
	}
}
int main() {
	int t; cin >> t;
	while (t--) {
		solve();
		cout << endl;
	}
	return 0;
}