Submission

Score: 100

User: Bestzu

Problemset: ตัวอักษรตัวแรกในคำ

Language: cpp

Time: 0.003 second

Submitted On: 2025-10-07 15:51:12

#include <bits/stdc++.h>
#define endl '\n'
using namespace std;



int main() {
    ios::sync_with_stdio(false); cin.tie(0);
	
	string s; cin >> s;
	sort(s.begin(), s.end()) ;
	int n = s.size();
	
	int i;
	if(s[0] != s[1]) {
		cout << s[0];
		return 0;
	}
	for(i = 1; i < n-1; i++) {
		if(s[i] != s[i+1] && s[i] != s[i-1]) {
			break;
		} 
	} 
	(i == 1) ? cout << s[i-1] : cout << s[i];
	return 0;
}