A_Wrong_Subtraction.cpp

#include <bits/stdc++.h>
using namespace std;

#define endl '\n'
#define pb push_back 
#define f first
#define s second 
#define min3(a, b, c) min(min(a, b), c)
#define max3(a, b, c) max(max(a, b), c)
#define all(v) v.begin(), v.end()


typedef long long ll;
typedef double ld;
typedef long double lld;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<pii> vpi;
typedef vector<pll> vpl;

const int INF = 1e9;
//const ll INF = 1e18;
const ll mod = 1000000007;
// const ll mod = 998244353;


void solve(){
	
	int n=0,a=0,r,i;
    scanf("%d %d",&n,&a);
    for(i=1; i<=a; i++)
    {
        r=n%10;
        if(r==0)
        {
            n/=10;
        }
        else
            n-=1;
    }
    printf("%d\n",n);
    
}

int main()
{
    ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);



    int t=1;
    //cin>>t;

    while(t--) 
    	solve();

    
    return 0;
}