A - Wrong Subtraction

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512 4
50

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import java.util.*;
public class Main
{
	public static void main(String[] args) {
	Scanner sc = new Scanner(System.in);
	int x = sc.nextInt();
	
	int y = sc.nextInt();
	for(int i =0;i<y;i++){
	    if(x%10!=0){
	        x= x-1;
	    }
	    else{
	        x= x/10;
	    }
	}System.out.print(x);
	}
}