#include <bits/stdc++.h>

using namespace std;
string a, b;

bool check(string a, string b) {
    for (int i = 0; i < a.size(); i++) {
        if (a[i] >= 'A' && a[i] <= 'Z') a[i] = a[i] + 32;
        if (b[i] >= 'A' && b[i] <= 'Z') b[i] = b[i] + 32;
        if (a[i] != b[i]) return false;
    }
    return true;
}

int main() {
    cin >> a >> b;
    if (a.size() != b.size())
        cout << 1 << endl;
    else if (a == b)
        cout << 2 << endl;
    else if (a.size() == b.size() && check(a, b))
        cout << 3 << endl;
    else
        cout << 4 << endl;
    return 0;
}