// 4 задача
#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
using namespace std;
int main()
{
    int k;
    cin >> k;
    vector <vector <string>> strings;
    vector <int> num;
    vector <int> count;
    string d;
    for (int i = 0; i < k; i++) {
        cin >> d;
        strings.push_back(vector<int>(d));
        for (int j = 0; j < 1; j++) {
            strings[i].push_back(d);
        }
    }
    for (int i = 0; i < k; ++i) {
        for (int j = 1; j < 100; ++j) {
            if (strings[i][j] == '1') {
                num[i] = j;
                break;
            }
        }
    }
    int a;
    for (int i = 0; i < k; ++i) {
        a = strings[i][j].size();
        for (int j = num[i]; j < a; j++) {
            if (strings[i][j] == '0') {
                count[i]++;
            }
        }
    }
    return 0;
}