#include <bits/stdc++.h>   using namespace std;   int main() {     cin.sync_with_stdio(false);     int ans, cnt, k;     string str;     while (cin >> str >> k) {       ans = 0;       cnt = 0;       int len = str.length();       for (int i = len - 1; i >= 0; i--) {         if (str[i] ==  0 ) {           ans++;         }       }       if (ans < k) {         cout << len - 1 << endl;       } else {         for (int i = len - 1; i >= 0; i--) {           if (str[i] !=  0 ) {             cnt++;           } else {             k--;           }           if (k == 0) {             break;           }         }         cout << cnt << endl;       }     }     return 0;   }   