public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int runs = sc . nextInt ( ) ;
  boolean a = true ;
  while ( runs -- > 0 ) {
    int size = sc . nextInt ( ) ;
    int num = 0 ;
    char [ ] s = new char [ 200 ] ;
    Arrays . fill ( s , 'a' ) ;
    System . out . println ( String . valueOf ( s ) ) ;
    for ( int i = 0 ;
    i < size ;
    i ++ ) {
      int temp = sc . nextInt ( ) ;
      if ( s [ temp ] == 'a' ) s [ temp ] = 'b' ;
      else s [ temp ] = 'a' ;
      System . out . println ( String . valueOf ( s ) ) ;
    }
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int runs = sc . nextInt ( ) ; boolean a = true ; while ( runs -- > 0 ) { int size = sc . nextInt ( ) ; int num = 0 ; char [ ] s = new char [ 200 ] ; Arrays . fill ( s , ' a ' ) ; System . out . println ( String . valueOf ( s ) ) ; for ( int i = 0 ; i < size ; i ++ ) { int temp = sc . nextInt ( ) ; if ( s [ temp ] == ' a ' ) s [ temp ] = ' b ' ; else s [ temp ] = ' a ' ; System . out . println ( String . valueOf ( s ) ) ; } } }
(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: (boolean_type) declarator: (variable_declarator name: (identifier) value: (true))) (while_statement condition: (parenthesized_expression (binary_expression left: (update_expression (identifier)) right: (decimal_integer_literal))) 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: (decimal_integer_literal))) (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) (character_literal)))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (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: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal))) consequence: (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal))) alternative: (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal)))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))))))))