import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class No00000671_Main {
	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	public static void main(String[] args) throws IOException {
		System.out.println(Math.abs(br.readLine().length() - "1000000007".length()));
	}
}