L1-011 A-B

#include <bits/stdc++.h>
using namespace std;
typedef long int ll;
const int N = 1e5 + 10;
void solve()
{
    string s;
    getline(cin, s);
    string ab;
    getline(cin,ab);
    bool st[s.length() + 1];
    memset(st, false, sizeof(st));
    for (int i = 0; ab[i]; i++)
    {
        for (int j = 0; j <= s.length(); j++)
        {
            if (ab[i] == s[j])
                st[j] = true;
        }
    }
    for (int i = 0; i <= s.length(); i++)
        if (st[i] == false)
            cout << s[i];
}
signed main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int t = 1;
    while (t--)
    {
        solve();
    }
    return 0;
}