ABC072B - OddString

問題：B - OddString

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

int main(void) {
    string s, ans = "";

    cin.tie(0);
    ios::sync_with_stdio(false);
    cin >> s;
    for (int i = 0; i < s.length(); i += 2) {
        ans += s[i];
    }

    cout << ans << "\n";
    return 0;
}