diff --git a/cv3/program.c b/cv3/program.c
index ed5f2f2..48006f4 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -43,7 +43,7 @@ void push(float number) {
     if (stack_top < STACK_SIZE - 1) {
         stack[++stack_top] = number;
     } else {
-        printf("Error: stack overflow\n");
+        printf("stack overflow\n");
         exit(0);
     }
 }
@@ -52,7 +52,7 @@ float pop() {
     if (stack_top >= 0) {
         return stack[stack_top--];
     } else {
-        printf("Error: stack is empty\n");
+        printf("stack is empty\n");
         exit(0);
     }
 }
@@ -95,7 +95,12 @@ int main() {
             push(result);
             print_stack();
         }
+        else {
+            printf("bad input\n");
+            return 0;
+        }
     }
+
     printf("no input\n");
 
     return 0;