diff --git a/du4/program.c b/du4/program.c
index 84e38e9..93dab6b 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -17,6 +17,7 @@ int main() {
         int valid = 1;
         float num1 = strtof(start, &end);
         if (end == start) {
+            printf("KONIEC\n");
             continue;
         }
         start = end;
@@ -24,7 +25,6 @@ int main() {
         // Find the operation symbol
         char op = *start;
         if (op != '+' && op != '-' && op != '*' && op != '/') {
-            printf("CHYBA\n");
             valid = 0;
         }
         start++;