diff --git a/a1/program.c b/a1/program.c
index 531c295..e64b6ec 100644
--- a/a1/program.c
+++ b/a1/program.c
@@ -9,7 +9,7 @@ int main() {
   char uloha[MAX_LINE_LENGTH];
 
   while (fgets(uloha, MAX_LINE_LENGTH, stdin) != NULL) {
-    if (strlen(uloha) <= 1) {
+    if (strlen(uloha) == 1 && uloha[0] == '\n') {
       printf("OK\n");
       continue;
     }