void solve()
{
    int cnt = 0;
    string a, b;
    cin >> a >> b;
    map<char, int> m1, m2;
    for (int i = 0; i < a.length(); i++)
    {
        if (a[i] != b[i])
            cnt++;
        m1[a[i]]++;
        m2[b[i]]++;
    }
    bool flag = true;
    map<char, int>::iterator it1 = m1.begin();
    map<char, int>::iterator it2 = m2.begin();
    while (it1 != m1.end())
    {
        if (it1->first != it2->first or it1->second != it2->second)
        {
            flag = false;
        }
        it1++, it2++;
    }
    cout << (flag and cnt ? "YES" : "NO") << endl;
}