Untitled

using namespace std;
#include <iostream>

int main()
{	
	int n;
	int k;
	cin >> n >> k;
	for (int i = 0; i < k;) {
		if (n % 10 == 0) {
			n = n / 10;
			i++;
		}

		if (n % 10 > 0 and i < k) {
			n = n - 1;
			i++;
		}
	}
	cout << n;
}