diff --git a/rust/sea_battle_cli_player/src/ui_screens/configure_game_rules.rs b/rust/sea_battle_cli_player/src/ui_screens/configure_game_rules.rs
index 9fa4bad..c3b6769 100644
--- a/rust/sea_battle_cli_player/src/ui_screens/configure_game_rules.rs
+++ b/rust/sea_battle_cli_player/src/ui_screens/configure_game_rules.rs
@@ -25,7 +25,7 @@ use crate::ui_widgets::button_widget::ButtonWidget;
 use crate::ui_widgets::checkbox_widget::CheckboxWidget;
 use crate::ui_widgets::text_editor_widget::TextEditorWidget;
 
-#[derive(num_derive::FromPrimitive, num_derive::ToPrimitive, Eq, PartialEq)]
+#[derive(num_derive::FromPrimitive, num_derive::ToPrimitive, Eq, PartialEq, Copy, Clone)]
 enum EditingField {
     MapWidth = 0,
     MapHeight,
@@ -128,7 +128,7 @@ impl GameRulesConfigurationScreen {
                             }
                         }
 
-                        KeyCode::Char(c) if ('0'..='9').contains(&c) => {
+                        KeyCode::Char(c) if c.is_ascii_digit() => {
                             let val = c.to_string().parse::<usize>().unwrap_or_default();
 
                             if self.curr_field == EditingField::MapWidth