diff --git a/main.cpp b/main.cpp
index de150c0..a08f942 100644
--- a/main.cpp
+++ b/main.cpp
@@ -28,8 +28,8 @@ int main()
         // TODO: remove static_cast
         int input_length = static_cast<int>(std::to_string(input).length());
         int first_digit = input % 10;
-        int middle_digit = ((input % 100) - first_digit) / 10;
         int last_two_digits = input % 100;
+        int middle_digit = ((last_two_digits) - first_digit) / 10;
 
         vector<string> result;
         string suffix = "";