#include <bits/stdc++.h>
using namespace std;
const long long int m = pow(10, 9) + 7;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  string s, t;
  cin >> s >> t;
  int j = 0, l = -1, r = -1;
  for (int i = 0; i < t.length(); i++) {
    if (s[j] == t[i]) j++;
    if (j == s.length()) {
      l = i + 1;
      break;
    }
  }
  reverse(s.begin(), s.end());
  j = 0;
  reverse(t.begin(), t.end());
  for (int i = 0; i < t.length(); i++) {
    if (s[j] == t[i]) j++;
    if (j == s.length()) {
      r = t.length() - i;
      break;
    }
  }
  if (l >= r || l == -1 || r == -1)
    cout << 0 << endl;
  else
    cout << r - l << endl;
  return 0;
}
