diff --git a/lab1/coding.cc b/lab1/coding.cc
index c06bb86..1b51ffd 100644
--- a/lab1/coding.cc
+++ b/lab1/coding.cc
@@ -1,14 +1,9 @@
 #include <coding.h>
 
 unsigned char encode(unsigned char c) {
-  if ((c >= 'A' && c <= 'Z'))
-    return ((c - 'A' + 13) % 26) + 'A';
-  else if ((c >= 'a' && c <= 'z'))
-    return ((c - 'a' + 13) % 26) + 'a';
-  else
-    return c; // Non-alphabetic characters are unchanged
+  return ++c;
 }
 
 unsigned char decode(unsigned char c) {
-  return encode(c); // ROT13 encoding and decoding are the same
+  return --c;
 }