bool is_valid(char ch)
{
    return (ch >= 'a' and ch <= 'z') or (ch >= 'A' and ch <= 'Z');
}

void solve()
{
    string s, holder;
    cin >> s;
    for (int i = 0; i < s.length(); i++)
    {
        if (is_valid(s[i]))
            holder += s[i];
    }
    reverse(holder.begin(), holder.end());
    int j = 0;
    for (int i = 0; i < s.length(); i++)
    {
        cout << (is_valid(s[i]) ? holder[j++] : s[i]);
    }
    cout << '\n';
}