diff --git a/a1/program.c b/a1/program.c
index 2800321..1dbd304 100644
--- a/a1/program.c
+++ b/a1/program.c
@@ -15,7 +15,7 @@ int main() {
         else if (i >= 'A' && i <= 'Z') {
             putchar(i - 'A' + 'a');
         }
-        else if (i >= 32 && i <= 126) {
+        else if (i == '\t' || (i >= 32 && i <= 126)) {
             putchar(i);
         }
     }