public static void main ( String [ ] args ) {
  FastScanner sc = new FastScanner ( ) ;
  int n = sc . nextInt ( ) ;
  int m = sc . nextInt ( ) ;
  ArrayList < Integer > [ ] gb = new ArrayList [ n ] ;
  ArrayList < Integer > [ ] gr = new ArrayList [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    gb [ i ] = new ArrayList < > ( ) ;
    gr [ i ] = new ArrayList < > ( ) ;
  }
  for ( int i = 0 ;
  i < m ;
  i ++ ) {
    int u = sc . nextInt ( ) - 1 ;
    int v = sc . nextInt ( ) - 1 ;
    String c = sc . next ( ) ;
    if ( c . equals ( "B" ) ) {
      gb [ u ] . add ( v ) ;
      gb [ v ] . add ( u ) ;
    }
    else {
      gr [ u ] . add ( v ) ;
      gr [ v ] . add ( u ) ;
    }
  };
}

public static void main ( String [ ] args ) { FastScanner sc = new FastScanner ( ) ; int n = sc . nextInt ( ) ; int m = sc . nextInt ( ) ; ArrayList < Integer > [ ] gb = new ArrayList [ n ] ; ArrayList < Integer > [ ] gr = new ArrayList [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { gb [ i ] = new ArrayList < > ( ) ; gr [ i ] = new ArrayList < > ( ) ; } for ( int i = 0 ; i < m ; i ++ ) { int u = sc . nextInt ( ) - 1 ; int v = sc . nextInt ( ) - 1 ; String c = sc . next ( ) ; if ( c . equals ( " B " ) ) { gb [ u ] . add ( v ) ; gb [ v ] . add ( u ) ; } else { gr [ u ] . add ( v ) ; gr [ v ] . add ( u ) ; } } ; }
(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)))) (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: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (generic_type (type_identifier) (type_arguments (type_identifier))) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (type_identifier) dimensions: (dimensions_expr (identifier))))) (local_variable_declaration type: (array_type element: (generic_type (type_identifier) (type_arguments (type_identifier))) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (type_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 (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (object_creation_expression type: (generic_type (type_identifier) (type_arguments)) arguments: (argument_list)))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (object_creation_expression type: (generic_type (type_identifier) (type_arguments)) arguments: (argument_list)))))) (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: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal)))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal)))) consequence: (block (expression_statement (method_invocation object: (array_access array: (identifier) index: (identifier)) name: (identifier) arguments: (argument_list (identifier)))) (expression_statement (method_invocation object: (array_access array: (identifier) index: (identifier)) name: (identifier) arguments: (argument_list (identifier))))) alternative: (block (expression_statement (method_invocation object: (array_access array: (identifier) index: (identifier)) name: (identifier) arguments: (argument_list (identifier)))) (expression_statement (method_invocation object: (array_access array: (identifier) index: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))))))