#include <bits/stdc++.h>
using namespace std;
const double eps = 1e-8;
const int mod = 1e9 + 7;
const int inf = 1061109567;
const int dir[][2] = {{-1, 0}, {1, 0}, {0, -1}, {0, 1}};
string a, b;
int main() {
  cin >> a >> b;
  int i, j;
  for (i = 0, j = 0; i < b.size(); i++) {
    if (a[j] == b[i]) {
      j++;
    }
    if (j == a.size()) break;
  }
  if (j != a.size()) {
    cout << "0" << endl;
    return 0;
  }
  int k;
  j = a.size() - 1;
  for (k = b.size() - 1; k >= 0; k--) {
    if (b[k] == a[j]) {
      j--;
    }
    if (j == -1) break;
  }
  if (j != -1) {
    cout << "0" << endl;
    return 0;
  }
  if (k <= i) {
    cout << "0" << endl;
  } else {
    cout << k - i << endl;
  }
}
