diff --git a/cv1/program.c b/cv1/program.c
index 90aa6e4..439375e 100644
--- a/cv1/program.c
+++ b/cv1/program.c
@@ -12,7 +12,7 @@ int main() {
                 putchar(ch - 32); 
             } else if (ch >= 'A' && ch <= 'Z') {
                 putchar(ch + 32); 
-            } else if (ch >= 32 && ch < 127) {
+            } else if ((ch >= 32 && ch < 127) || ch==9){
                 putchar(ch);
             }
         }