diff --git a/cv3/program.c b/cv3/program.c
index 77eb87b..48054af 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -45,6 +45,13 @@ int main() {
     inicStEk(&stek);
     char bufer[256];
     while (fgets(bufer, sizeof(bufer), stdin) != NULL) {
+        if (bufer[0] == '\n') {
+            printf("no input\n");
+            return 0;
+        }
+        
+
+        
         char* konec;
         double chislo = strtod(bufer, &konec);
         char c = konec[0];
@@ -75,10 +82,10 @@ int main() {
                 }
                 push(&stek, a / b);
             }
-        } else if (isalpha(c)) {
+        } else if (!isdigit(c) || !isalpha(c)) {
             printf("bad input\n");
             return 0;
-        } else {
+        } else{
             printf("no input\n");
             return 0;
         }