Submission

Score: 100

User: jeeno987

Problemset: ตัวอักษรตัวแรกในคำ

Language: cpp

Time: 0.005 second

Submitted On: 2026-10-10 18:18:00

#include <iostream>
#include <string>
using namespace std;

int main() {
    string s;
    cin >> s;
    int cnt[26] = {0};
    for (int i = 0; i < (int)s.size(); i++)
        if (s[i] >= 'A' && s[i] <= 'Z') cnt[s[i] - 'A']++;
    for (int c = 0; c < 26; c++)
        if (cnt[c] == 1) { cout << char('A' + c) << '\n'; return 0; }
    return 0;
}