// qdd on Jan 21, 2023

#ifdef qdd
#include <ringo>
#else
#include <bits/stdc++.h>
#define dbg(...)
#define dbgr(x, y)
#endif

using namespace std;

using ll = long long;

#define ALL(x) begin(x), end(x)

template <class T>
istream& operator>>(istream& is, vector<T>& v) {
  for (T& x : v) is >> x;
  return is;
}

template <class T>
ostream& operator<<(ostream& os, const vector<T>& v) {
  bool f = 0;
  for (const T& x : v) (f ? os << ' ' : os) << x, f = 1;
  return os;
}

void sol() {
  string s, t;
  cin >> s >> t;
  int ans = 1;
  for (int i = 0; i < 4; i++) {
    ans *= (s[i] == t[i] ? 1 : 2);
  }
  cout << ans << '\n';
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  sol();
  return 0;
}