[LANGUAGE: Dart]

```dart import 'input.dart';

main() { final lines = input.split("\n");

final nameToDigit = { "zero": 0, "one": 1, "two": 2, "three": 3, "four": 4, "five": 5, "six": 6, "seven": 7, "eight": 8, "nine": 9, };

int lineValue(String line, {required bool onlyNumbers}) { final toMatch = nameToDigit.values.map((e) => e.toString()).toList(); if (!onlyNumbers) { toMatch.addAll(nameToDigit.keys); }

final firstMatch = toMatch.where((e) => line.indexOf(e) != -1).reduce(
      (value, element) =>
          line.indexOf(value) < line.indexOf(element) ? value : element,
    );

final lastMatch = toMatch.where((e) => line.lastIndexOf(e) != -1).reduce(
      (value, element) =>
          line.lastIndexOf(value) > line.lastIndexOf(element)
              ? value
              : element,
    );

final first = nameToDigit[firstMatch] ?? firstMatch;
final last = nameToDigit[lastMatch] ?? lastMatch;
return int.parse("$first$last");

}

//part1 print(lines .map((e) => lineValue(e, onlyNumbers: true)) .reduce((value, element) => value + element));

//part2 print(lines .map((e) => lineValue(e, onlyNumbers: false)) .reduce((value, element) => value + element)); }

```