diff --git a/cv3/program.c b/cv3/program.c
index 9e4c138..9f39b2b 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -47,6 +47,7 @@ int main() {
         float r = 0;
          
         if(!isdigit(line[0]) && line[0] != '+' && line[0] != '*' && line[0] != '/' && line[0] != '-'){
+            printf("no input");
             return 0;
         }