public static void main ( String [ ] args ) {
  Scanner scan = new Scanner ( System . in ) ;
  int n = scan . nextInt ( ) ;
  boolean [ ] column = new boolean [ n ] ;
  boolean row = true , actualRow = false ;
  boolean [ ] [ ] matriz = new boolean [ n ] [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    String string = scan . next ( ) ;
    int index = 0 ;
    actualRow = false ;
    for ( char c : string . toCharArray ( ) ) {
      if ( c == 'E' ) {
        matriz [ i ] [ index ] = false ;
      }
      else {
        matriz [ i ] [ index ] = true ;
        actualRow = true ;
        column [ index ] = true ;
      }
      index ++ ;
    }
    if ( ! actualRow ) {
      row = false ;
    }
  }
  if ( row ) {
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      for ( int j = 0 ;
      j < n ;
      j ++ ) {
        if ( matriz [ i ] [ j ] ) {
          System . out . print ( i + 1 ) ;
          System . out . print ( " " ) ;
          System . out . println ( j + 1 ) ;
          break ;
        }
      }
    }
  }
  else {
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      if ( ! column [ i ] ) {
        System . out . println ( "-1" ) ;
        return ;
      }
    }
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      for ( int j = 0 ;
      j < n ;
      j ++ ) {
        if ( matriz [ j ] [ i ] ) {
          System . out . print ( j + 1 ) ;
          System . out . print ( " " ) ;
          System . out . println ( i + 1 ) ;
          break ;
        }
      }
    }
  }
  scan . close ( ) ;
}

public static void main ( String [ ] args ) { Scanner scan = new Scanner ( System . in ) ; int n = scan . nextInt ( ) ; boolean [ ] column = new boolean [ n ] ; boolean row = true , actualRow = false ; boolean [ ] [ ] matriz = new boolean [ n ] [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { String string = scan . next ( ) ; int index = 0 ; actualRow = false ; for ( char c : string . toCharArray ( ) ) { if ( c == ' E ' ) { matriz [ i ] [ index ] = false ; } else { matriz [ i ] [ index ] = true ; actualRow = true ; column [ index ] = true ; } index ++ ; } if ( ! actualRow ) { row = false ; } } if ( row ) { for ( int i = 0 ; i < n ; i ++ ) { for ( int j = 0 ; j < n ; j ++ ) { if ( matriz [ i ] [ j ] ) { System . out . print ( i + 1 ) ; System . out . print ( " ▁ " ) ; System . out . println ( j + 1 ) ; break ; } } } } else { for ( int i = 0 ; i < n ; i ++ ) { if ( ! column [ i ] ) { System . out . println ( " - 1" ) ; return ; } } for ( int i = 0 ; i < n ; i ++ ) { for ( int j = 0 ; j < n ; j ++ ) { if ( matriz [ j ] [ i ] ) { System . out . print ( j + 1 ) ; System . out . print ( " ▁ " ) ; System . out . println ( i + 1 ) ; break ; } } } } scan . close ( ) ; }
(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: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (boolean_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (boolean_type) dimensions: (dimensions_expr (identifier))))) (local_variable_declaration type: (boolean_type) declarator: (variable_declarator name: (identifier) value: (true)) declarator: (variable_declarator name: (identifier) value: (false))) (local_variable_declaration type: (array_type element: (boolean_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (boolean_type) dimensions: (dimensions_expr (identifier)) dimensions: (dimensions_expr (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: (type_identifier) 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))) (expression_statement (assignment_expression left: (identifier) right: (false))) (enhanced_for_statement type: (integral_type) name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (character_literal))) consequence: (block (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier)) right: (false)))) alternative: (block (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier)) right: (true))) (expression_statement (assignment_expression left: (identifier) right: (true))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (true))))) (expression_statement (update_expression (identifier))))) (if_statement condition: (parenthesized_expression (unary_expression operand: (identifier))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (false))))))) (if_statement condition: (parenthesized_expression (identifier)) consequence: (block (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 (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 (if_statement condition: (parenthesized_expression (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal))))) (break_statement)))))))) alternative: (block (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 (if_statement condition: (parenthesized_expression (unary_expression operand: (array_access array: (identifier) index: (identifier)))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) (return_statement))))) (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 (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 (if_statement condition: (parenthesized_expression (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal))))) (break_statement))))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))