A.cpp

/*
Templete by norman/KNN-07
*/
#include <bits/stdc++.h>
using namespace std;
#define el endl
#define mp make_pair
#define pb push_back
#define ppb pop_back
#define pf push_front
#define fi first
#define nd second
#define forinc(i, a, b) for (int i = a; i <= b; i++)
#define fordec(i, a, b) for (int i = a; i >= b; i--)
#define mms(a, v) memset(a, v, sizeof(a))
#define lwb(a, v) lower_bound(a.begin(), a.end(), v)
#define upb(a, v) upper_bound(a.begin(), a.end(), v)
typedef long long ll;
typedef long double ldb;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef map<int, int> mii;
typedef map<ll, ll> mll;
typedef vector<bool> vb;
typedef unordered_set<char> chrset;

int main()
{
    ll inp;
    int k;
    cin >> inp >> k;
    for (int i = 0; i < k; i++)
    {
        if (inp % 10 != 0)
        {
            inp--;
        }
        else
        {
            inp /= 10;
        }
    }

    cout << inp;
}