#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_LL( VAR , INITIAL , FINAL_PLUS_ONE ) for( ll VAR = INITIAL ; VAR < FINAL_PLUS_ONE ; VAR ++ ) 
#define FOR_ITR( ARRAY , ITR , END ) for( auto ITR = ARRAY .begin() , END = ARRAY .end() ; ITR != END ; ITR ++ ) 
#define RETURN( LL , ANSWER ) const LL answer_for_contest = ( ANSWER ); cout << answer_for_contest << endl; return 0 

template <typename T> inline T Distance( const T& a , const ll& b ){ return a < b ? b - a : a - b; }



int main()
{

  CIN( string , abc );
  ll n[3] = { stoi( abc.substr( 0 , 1 ) ) , stoi( abc.substr( 1 , 1 ) ) , stoi( abc.substr( 2 , 1 ) ) };
  ll min = 10;
  ll max = -1;
  FOR_LL( i , 0 , 3 ){
    if( n[i] < min ){
      min = n[i];
    }
    if( max < n[i] ){
      max = n[i];
    }
  }
  RETURN( ll , max - min );

}