diff --git a/cv3/program.c b/cv3/program.c
index ac87fc0..6664f3a 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -47,6 +47,10 @@ int main() {
         char* konec;
         double chislo = strtod(bufer, &konec);
         if (*konec == '\n' && *bufer != '\n' && *bufer != ' ') {
+            if (konec - bufer == 1) {
+                printf("bad input\n");
+                exit(1);
+            }
             push(&stek, chislo);
         } else if (strcmp(konec, "+\n") == 0) {
             if (isEmpty(&stek)) {
@@ -103,7 +107,7 @@ int main() {
             }
             push(&stek, a / b);
         } else {
-            printf("no input\n");
+            printf("bad input\n");
             exit(1);
         }
         for (int i = 0; i < stek.vershina; i++) {