diff --git a/cv1/program.c b/cv1/program.c
index 5ee1842..a7368f5 100644
--- a/cv1/program.c
+++ b/cv1/program.c
@@ -1,6 +1,29 @@
 #include <stdio.h>
+#include <ctype.h>
 
-int main(){
-	printf("Hello World!\n");
-	return 0;
+int main() {
+    int ch;
+    int visibleChars = 0;
+
+    printf("Zadajte text (ukoncite vstup s Ctrl+D):\n");
+
+    while ((ch = getchar()) != EOF) {
+        if (islower(ch)) {
+            ch = toupper(ch);
+        } else if (isupper(ch)) {
+            ch = tolower(ch);
+        }
+
+        if (isprint(ch) || ch == '\n') {
+            putchar(ch);
+            if (ch != '\n') {
+                visibleChars++;
+            }
+        }
+    }
+
+    printf("\nPocet načítaných riadkov: %d\n", visibleChars);
+
+    return 0;
 }
+