#include <iostream>
#include <list>
#include <vector>
#include <string>
#include <stdio.h>
#include <stdint.h>
#include <iomanip>
using namespace std;

using uint = unsigned int;
using ll = long long;

#define CIN( LL , A ) LL A; cin >> A 
#define GETLINE( A ) string A; getline( cin , A ) 
#define FOR_ITR( ARRAY , ITR , END ) for( auto ITR = ARRAY .begin() , END = ARRAY .end() ; ITR != END ; ITR ++ ) 

void CountZero( ll& P ,  ll& num_P )
{

  P /= 10;
  num_P = 0;

  while( P != 1 ){

    P /= 10;
    num_P++;

  }

  return;

}

int main()
{

  ll P = 1000000007;
  ll num_P;
  CountZero( P , num_P );

  CIN( ll , N );
  ll num_N;
  CountZero( N , num_N );

  ll answer = num_P < num_N ? num_N - num_P : num_P - num_N;
  cout << answer << endl;
  return 0;

}