Submission

Score: 100

User: Newton4566

Problemset: ตัวอักษรตัวแรกในคำ

Language: cpp

Time: 0.004 second

Submitted On: 2026-10-13 17:50:45

#include <bits/stdc++.h>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    string str;
    cin >> str;

    int count[26] = {0};

    for (int i = 0; i < str.size(); ++i) {
        ++count[str[i] - 'A'];
    }

    for (int i = 0; i < 26; ++i)
        if (count[i] != 0 && count[i] < 2) {
            cout << (char)(i + 'A');
            break;
        }

    return 0;
}