diff --git a/cv3/program.c b/cv3/program.c
index 8f52936..c678089 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -19,6 +19,7 @@ int main(){
         fgets(vstup, STACK_SIZE, stdin);
         vstup[strcspn(vstup, "\n")] = 0;
         if(strlen(vstup) == 0){
+            printf("no input");
             break;
         }
         if(vstup[0] == '-' || vstup[0] == '+' || vstup[0] == '*' || vstup[0] == '/'){