A_Wrong_Subtraction.cpp

#include<iostream>
using namespace std;
int main()
{
    int num,k;
    cin>>num>>k;
    for (int i = 0; i < k; i++)
    {
        if(num % 10 == 0) num /= 10;
        else num -= 1;
    }
    cout<<num;

    return 0;
}