diff --git a/src/Year_2015/P10.py b/src/Year_2015/P10.py
index d116a6b..de77dd4 100644
--- a/src/Year_2015/P10.py
+++ b/src/Year_2015/P10.py
@@ -23,9 +23,12 @@
 
 from itertools import groupby
 
+with open("files/P10.txt", "r") as f:
+    number = f.read().strip().split()[0]
+
 
 def part_1() -> None:
-    num = "3113322113"
+    num = number
     for _ in range(40):
         num = "".join(str(len(list(g))) + k for k, g in groupby(num))
 
@@ -42,7 +45,7 @@ def part_1() -> None:
 
 
 def part_2() -> None:
-    num = "3113322113"
+    num = number
     for _ in range(50):
         num = "".join(str(len(list(g))) + k for k, g in groupby(num))