Submission

Score: 100

User: Kei

Problemset: ตัวอักษรตัวแรกในคำ

Language: cpp

Time: 0.002 second

Submitted On: 2026-10-07 17:19:22

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

void solve(){
    string s;
    cin >> s;
    sort(s.begin(),s.end());
    for(int i=0;i<s.size()-1;i++){
        if(s[i]==s[i+1]){
            int j=i;
            while(j<(int)s.size() && s[j]==s[i]) j++;
            s.erase(i,j-i);
            i--;
        }
    }
    cout<< s[0];
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    solve();
    return 0;
}