import java.util.Scanner;

class no671{
	public static void main(String[] args) {
		Scanner stdIn=new Scanner(System.in);
		long n=stdIn.nextLong();
		int i=0;
		while(n!=0) {
			n=n/10;
			i++;
		}
		int ans;
		if(i==10) ans=0;
		else if(i>10) ans=i-10;
		else ans=10-i;
		System.out.println(ans);
	}
}