#include <bits/stdc++.h>   using namespace std;   using ll = long long;   const int N = 1e5 + 5;   int main() {     ios::sync_with_stdio(false);     cin.tie(nullptr);     int T;     cin >> T;     while (T--) {       string x, y;       cin >> x >> y;       int lx = x.size(), ly = y.size();       int py = 1;       while (y[ly - py] ==  0 ) ++py;       int px = py;       while (lx >= px && x[lx - px] ==  0 ) ++px;       cout << px - py << endl;     }     return 0;   }   