public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  String a = sc . next ( ) , b = sc . next ( ) ;
  int dif = 0 , dif2 = 0 , q = 0 , w = 0 , temp = 0 ;
  for ( int i = 0 ;
  i < a . length ( ) ;
  i ++ ) {
    q = Integer . parseInt ( String . valueOf ( a . charAt ( i ) ) ) ;
    w = Integer . parseInt ( String . valueOf ( b . charAt ( i ) ) ) ;
    temp = q - w ;
    if ( temp > 0 ) {
      dif ++ ;
    }
    else if ( temp < 0 ) {
      dif2 ++ ;
    }
  }
  if ( dif >= dif2 ) {
    System . out . println ( dif ) ;
  }
  else {
    System . out . println ( dif2 ) ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; String a = sc . next ( ) , b = sc . next ( ) ; int dif = 0 , dif2 = 0 , q = 0 , w = 0 , temp = 0 ; for ( int i = 0 ; i < a . length ( ) ; i ++ ) { q = Integer . parseInt ( String . valueOf ( a . charAt ( i ) ) ) ; w = Integer . parseInt ( String . valueOf ( b . charAt ( i ) ) ) ; temp = q - w ; if ( temp > 0 ) { dif ++ ; } else if ( temp < 0 ) { dif2 ++ ; } } if ( dif >= dif2 ) { System . out . println ( dif ) ; } else { System . out . println ( dif2 ) ; } }
(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: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) 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: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (update_expression (identifier)))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (update_expression (identifier)))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))) alternative: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))))