diff --git a/du1/program.c b/du1/program.c
index ba48d8d..01c4897 100644
--- a/du1/program.c
+++ b/du1/program.c
@@ -13,10 +13,10 @@ while(r != EOF){
 	}
 
 	if(r >= 'a' && r <= 'z'){
-	r = r + 32;
+	r -= 32;
 	}
 	else if(r >= 'A' && r <= 'Z'){
-		r = r - 32;
+		r += 32;
 	}
 putchar(r);
 }