diff --git a/du1/program.c b/du1/program.c
deleted file mode 100644
index f676107..0000000
--- a/du1/program.c
+++ /dev/null
@@ -1,19 +0,0 @@
-#include <stdio.h>
-
-int main() {
-    int lines=0;
-    char symbol;
-    while ((symbol=getchar()) !=EOF) {
-        if (symbol>= 'A' && symbol <= 'Z') {
-            putchar(symbol+32);
-        } else { if (symbol >= 'a' && symbol <= 'z') {
-            putchar(symbol-32);
-        } else { putchar(symbol); }
-        }
-        if (symbol == '\n') {
-            lines++;
-        }
-    }
-    printf("Number of lines:%d\n", lines);
-    return 0;
-}
\ No newline at end of file