static int divisible ( String num ) {
  int n = num . length ( ) ;
  int sum = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) sum += ( int ) ( num . charAt ( i ) ) ;
  if ( sum % 3 == 0 ) return 0 ;
  if ( n == 1 ) return - 1 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) if ( sum % 3 == ( num . charAt ( i ) - '0' ) % 3 ) return 1 ;
  if ( n == 2 ) return - 1 ;
  return 2 ;
}

static int divisible ( String num ) { int n = num . length ( ) ; int sum = 0 ; for ( int i = 0 ; i < n ; i ++ ) sum += ( int ) ( num . charAt ( i ) ) ; if ( sum % 3 == 0 ) return 0 ; if ( n == 1 ) return - 1 ; for ( int i = 0 ; i < n ; i ++ ) if ( sum % 3 == ( num . charAt ( i ) - '0' ) % 3 ) return 1 ; if ( n == 2 ) return - 1 ; return 2 ; }
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