public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  char [ ] first = sc . nextLine ( ) . toCharArray ( ) ;
  char [ ] second = sc . nextLine ( ) . toCharArray ( ) ;
  int [ ] letters = new int [ 26 ] ;
  Arrays . fill ( letters , 0 ) ;
  if ( first . length != second . length ) {
    System . out . println ( "NO" ) ;
    return ;
  }
  if ( first . length == 1 ) {
    if ( first [ 0 ] != second [ 0 ] ) System . out . println ( "NO" ) ;
    else System . out . println ( "YES" ) ;
    return ;
  }
  int count = 0 ;
  for ( int i = 0 ;
  i < first . length ;
  i ++ ) {
    if ( first [ i ] != second [ i ] ) count ++ ;
    letters [ ( int ) first [ i ] - 97 ] ++ ;
    letters [ ( int ) second [ i ] - 97 ] -- ;
  }
  for ( int i = 0 ;
  i < 26 ;
  i ++ ) {
    if ( letters [ i ] != 0 ) {
      System . out . println ( "NO" ) ;
      return ;
    }
  }
  if ( count == 2 ) System . out . println ( "YES" ) ;
  else System . out . println ( "NO" ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; char [ ] first = sc . nextLine ( ) . toCharArray ( ) ; char [ ] second = sc . nextLine ( ) . toCharArray ( ) ; int [ ] letters = new int [ 26 ] ; Arrays . fill ( letters , 0 ) ; if ( first . length != second . length ) { System . out . println ( " NO " ) ; return ; } if ( first . length == 1 ) { if ( first [ 0 ] != second [ 0 ] ) System . out . println ( " NO " ) ; else System . out . println ( " YES " ) ; return ; } int count = 0 ; for ( int i = 0 ; i < first . length ; i ++ ) { if ( first [ i ] != second [ i ] ) count ++ ; letters [ ( int ) first [ i ] - 97 ] ++ ; letters [ ( int ) second [ i ] - 97 ] -- ; } for ( int i = 0 ; i < 26 ; i ++ ) { if ( letters [ i ] != 0 ) { System . out . println ( " NO " ) ; return ; } } if ( count == 2 ) System . out . println ( " YES " ) ; else System . out . println ( " NO " ) ; }
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(identifier) name: (identifier) arguments: (argument_list)) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (decimal_integer_literal))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (decimal_integer_literal)))) (if_statement condition: (parenthesized_expression (binary_expression left: (field_access object: (identifier) field: (identifier)) right: (field_access object: (identifier) field: (identifier)))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) (return_statement))) (if_statement condition: (parenthesized_expression (binary_expression left: (field_access object: (identifier) field: (identifier)) right: (decimal_integer_literal))) consequence: (block (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (array_access array: (identifier) index: (decimal_integer_literal)))) consequence: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) alternative: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal))))) (return_statement))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: 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(local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) (return_statement))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) alternative: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))))))