//colourfulstones(simplified edition) #include using namespace std; int main() { int i, n = 1, k = 0; string s, t;

cin >> s >> t;
if (s.length() >= t.length())
{
    for (i = 0; i < t.length(); i++)
    {
        if (s[k] == t[i])
        {
            k++;
            n++;
        }
    }
}
else
{
    for (i = 0; i < t.length(); i++)
    {
        if (s[k] == t[i])
        {
            k++;
            n++;
        }
    }
}
    cout << n;

    return 0;
}