public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  long N = sc . nextLong ( ) ;
  int m = ( int ) Math . sqrt ( N ) ;
  int ans = 100 ;
  for ( int i = m ;
  i > 0 ;
  i -- ) {
    if ( N % i == 0 ) {
      long A = i ;
      long B = N / i ;
      int count = 0 ;
      while ( A > 0 || B > 0 ) {
        A /= 10 ;
        B /= 10 ;
        count ++ ;
      }
      ans = Math . min ( ans , count ) ;
      break ;
    }
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; long N = sc . nextLong ( ) ; int m = ( int ) Math . sqrt ( N ) ; int ans = 100 ; for ( int i = m ; i > 0 ; i -- ) { if ( N % i == 0 ) { long A = i ; long B = N / i ; int count = 0 ; while ( A > 0 || B > 0 ) { A /= 10 ; B /= 10 ; count ++ ; } ans = Math . min ( ans , count ) ; break ; } } System . out . println ( ans ) ; }
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