479_A

#include <iostream>
#include <algorithm>
using namespace std;
int main() {
    long long n;
    int k;
    cin >> n >> k;
    string s = to_string(n);
    for (int i = s.length() - 1; i >= 0; ) {
        if (k > 0) {
            if (s[s.length() - 1] == '0') {
                --k;
                s = s.substr(0, s.length() - 1);
            } else {
                if (k >= s[s.length() - 1] - '0') {
                    k -= (s[s.length() - 1] - '0');
                    s[s.length() - 1] = '0';
                } else {
                    s[s.length() - 1] = (((s[s.length() - 1] - '0') - k) + '0');
                    k = 0;
                }
            }
        }
        if (!k) {
            break;
        }
    }
    cout << s << endl;
}