Do day 1.

d1.py

@@ -0,0 +1,89 @@
+import re
+
+EXAMPLE = """
+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet
+"""
+
+EXAMPLE2 = """
+two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen
+"""
+
+WORD_TO_DIGIT = {
+    "1": "1",
+    "2": "2",
+    "3": "3",
+    "4": "4",
+    "5": "5",
+    "6": "6",
+    "7": "7",
+    "8": "8",
+    "9": "9",
+    "one": "1",
+    "two": "2",
+    "three": "3",
+    "four": "4",
+    "five": "5",
+    "six": "6",
+    "seven": "7",
+    "eight": "8",
+    "nine": "9",
+}
+
+def get_sum(text: str):
+    s = 0
+    r = re.compile(r"[^\d]")
+    for line in text.splitlines():
+        if line.strip() == "":
+            continue
+        line = r.sub("", line)
+        s += int(line[0] + line[-1])
+    return s
+
+def get_sum2(text: str):
+    s = 0
+    for line in text.splitlines():
+        if line.strip() == "":
+            continue
+
+        first = ""
+        for i in range(len(line)):
+            for (word, digit) in WORD_TO_DIGIT.items():
+                if word == line[i:i + len(word)]:
+                    first = digit
+                    break
+            if first != "":
+                break
+
+        last = ""
+        for i in range(len(line), 0, -1):
+            for (word, digit) in WORD_TO_DIGIT.items():
+                if word == line[i - len(word):i]:
+                    last = digit
+                    break
+            if last != "":
+                break
+
+        v = first + last
+        s += int(v)
+    return s
+
+if __name__ == "__main__":
+    assert(get_sum(EXAMPLE) == 142)
+    assert(get_sum2(EXAMPLE2) == 281)
+    with open("i1.txt", 'r') as f:
+        text = f.read()
+        r = get_sum(text)
+        print(r)
+        assert(r == 55386)
+        r = get_sum2(text)
+        print(r)
+        assert(r == 54824)