public static void main ( String [ ] args ) {
  long N = sc . nextLong ( ) ;
  long ans = Long . MAX_VALUE ;
  long rootN = ( long ) Math . sqrt ( N ) ;
  for ( long i = 1 ;
  i <= rootN ;
  i ++ ) {
    long muti = N / i ;
    if ( N % i == 0 ) {
      ans = Math . min ( ans , digit ( muti ) ) ;
    }
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { long N = sc . nextLong ( ) ; long ans = Long . MAX_VALUE ; long rootN = ( long ) Math . sqrt ( N ) ; for ( long i = 1 ; i <= rootN ; i ++ ) { long muti = N / i ; if ( N % i == 0 ) { ans = Math . min ( ans , digit ( muti ) ) ; } } System . out . println ( ans ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (field_access object: (identifier) field: (identifier)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (cast_expression type: (integral_type) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (method_invocation name: (identifier) arguments: (argument_list (identifier))))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))