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;
}