diff --git a/a1/program.c b/a1/program.c
index 642c64e..b0b4c41 100644
--- a/a1/program.c
+++ b/a1/program.c
@@ -1,8 +1,9 @@
 #include <stdio.h>
+#include <ctype.h>
 
 int main() {
-    int c = 0;
-    int pocet_riadkov = 0;
+    int c = 0; 
+    int pocet_riadkov = 0; 
 
     while (1) {
         c = getchar();
@@ -11,10 +12,14 @@ int main() {
             break;
         }
 
-        if (c >= 'a' && c <= 'z') {
-            c = c - 'a' + 'A';
-        } else if (c >= 'A' && c <= 'Z') {
-            c = c - 'A' + 'a';
+        if (isalpha(c)) {
+            if (c >= 'a' && c <= 'z') {
+                c = c - 'a' + 'A';
+            } else if (c >= 'A' && c <= 'Z') {
+                c = c - 'A' + 'a';
+            }
+        } else if (c == 1425) { 
+            c = 'q';
         }
 
         if (c == '\n') {